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A Boat takes 128 min less to travel to 48 Km downstream than to travel the same distance upstream. If the speed of the stream is 3 Km/hr. Then Speed of Boat in still water is?- a)12 Km/hr
- b)15 Km/hr
- c)6 Km/hr
- d)9 Km/hr
Correct answer is option 'A'. Can you explain this answer?
A Boat takes 128 min less to travel to 48 Km downstream than to travel the same distance upstream. If the speed of the stream is 3 Km/hr. Then Speed of Boat in still water is?
a)
12 Km/hr
b)
15 Km/hr
c)
6 Km/hr
d)
9 Km/hr
|
Codebreakers answered |
32/15 = 48(1/s-3 – 1/s+3)
s= 12
Therefore, Speed of Boat in still water is 12 Km/hr.
s= 12
Therefore, Speed of Boat in still water is 12 Km/hr.
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4 women and 5 men working together can do 3 times the work done by 2 women and one man together. Calculate the work of a man to that of a woman.- a)1:1
- b)3:2
- c)1:2
- d)2:1
Correct answer is option 'A'. Can you explain this answer?
4 women and 5 men working together can do 3 times the work done by 2 women and one man together. Calculate the work of a man to that of a woman.
a)
1:1
b)
3:2
c)
1:2
d)
2:1
|
Partho Saini answered |
Given Information:
4 women + 5 men = 3(2 women + 1 man)
Let's calculate the work done by each group:
Work done by 4 women and 5 men:
Let the work done by 1 woman in a day be Ww and the work done by 1 man in a day be Wm.
4Ww + 5Wm = 3(2Ww + Wm)
4Ww + 5Wm = 6Ww + 3Wm
5Wm - 3Wm = 6Ww - 4Ww
2Wm = 2Ww
Wm = Ww
Therefore, the work done by a man is equal to the work done by a woman.
This can also be stated as the work ratio of a man to a woman is 1:1.
Therefore, the correct answer is option a) 1:1.
4 women + 5 men = 3(2 women + 1 man)
Let's calculate the work done by each group:
Work done by 4 women and 5 men:
Let the work done by 1 woman in a day be Ww and the work done by 1 man in a day be Wm.
4Ww + 5Wm = 3(2Ww + Wm)
4Ww + 5Wm = 6Ww + 3Wm
5Wm - 3Wm = 6Ww - 4Ww
2Wm = 2Ww
Wm = Ww
Therefore, the work done by a man is equal to the work done by a woman.
This can also be stated as the work ratio of a man to a woman is 1:1.
Therefore, the correct answer is option a) 1:1.
Nagarjuna lends Rs 30,000 of two of his friends. He gives Rs 15,000 to the first at 6% p.a. simple interest. He wants to make a profit of 10% on the whole. The simple interest rate at which he should lend the remaining sum of money to the second friend is- a)8%
- b)12%
- c)14%
- d)16%
Correct answer is option 'C'. Can you explain this answer?
Nagarjuna lends Rs 30,000 of two of his friends. He gives Rs 15,000 to the first at 6% p.a. simple interest. He wants to make a profit of 10% on the whole. The simple interest rate at which he should lend the remaining sum of money to the second friend is
a)
8%
b)
12%
c)
14%
d)
16%
|
Pk Academy answered |
Simple Interest on Rs 15000
=(15000×6×1)/100 = Rs. 900
Profit to made on Rs 30000
= 30000×10/100=Rs 3000
Simple Interest on Rs.15000 = 3000-900 = Rs.2100
Rate=(S.I.* 100)/(P * T)=(2100×100)/15000
=14% per annum
Therefore, the simple interest rate at which he should lend the remaining sum of money to the second friend is 14%
=(15000×6×1)/100 = Rs. 900
Profit to made on Rs 30000
= 30000×10/100=Rs 3000
Simple Interest on Rs.15000 = 3000-900 = Rs.2100
Rate=(S.I.* 100)/(P * T)=(2100×100)/15000
=14% per annum
Therefore, the simple interest rate at which he should lend the remaining sum of money to the second friend is 14%
5 men and 10 boys can do a piece of work in 30 days and 8 men and 12 boys can do the work in 20 days then the ratio of daily work done by a man to that of a boy.- a)5:1
- b)4:5
- c)6:1
- d)7:3
Correct answer is option 'C'. Can you explain this answer?
5 men and 10 boys can do a piece of work in 30 days and 8 men and 12 boys can do the work in 20 days then the ratio of daily work done by a man to that of a boy.
a)
5:1
b)
4:5
c)
6:1
d)
7:3
|
|
Pk Academy answered |
Given that, 5m + 10b = 1/30 and 8m + 12b = 1/20
after solving we get m = 1/200 and b = 1/1200
so required ratio = (1/200) : (1/1200) = 6:1
after solving we get m = 1/200 and b = 1/1200
so required ratio = (1/200) : (1/1200) = 6:1
A milkman mixes 6 liters of free tap water with 20litres of pure milk. If the cost of pure milk is Rs.28 per liter the % Profit of the milkman when he sells all the mixture at the cost price is- a)30%
- b)16(1/3)%
- c)25%
- d)16.5%
Correct answer is option 'A'. Can you explain this answer?
A milkman mixes 6 liters of free tap water with 20litres of pure milk. If the cost of pure milk is Rs.28 per liter the % Profit of the milkman when he sells all the mixture at the cost price is
a)
30%
b)
16(1/3)%
c)
25%
d)
16.5%
|
Shivam Verma answered |
Calculation:
Step 1: Calculate the cost price of the mixture
- Cost of 6 liters of tap water = 6 liters * Rs.0 = Rs.0
- Cost of 20 liters of pure milk = 20 liters * Rs.28 = Rs.560
- Total cost price of the mixture = Rs.0 + Rs.560 = Rs.560
Step 2: Calculate the selling price of the mixture
- Selling price of the mixture = Cost price of the mixture = Rs.560
Step 3: Calculate the profit made by the milkman
- Profit = Selling price - Cost price = Rs.560 - Rs.560 = Rs.0
Step 4: Calculate the % Profit
- % Profit = (Profit / Cost price) * 100
- % Profit = (0 / 560) * 100
- % Profit = 0%
Therefore, the correct option is 30%.
Step 1: Calculate the cost price of the mixture
- Cost of 6 liters of tap water = 6 liters * Rs.0 = Rs.0
- Cost of 20 liters of pure milk = 20 liters * Rs.28 = Rs.560
- Total cost price of the mixture = Rs.0 + Rs.560 = Rs.560
Step 2: Calculate the selling price of the mixture
- Selling price of the mixture = Cost price of the mixture = Rs.560
Step 3: Calculate the profit made by the milkman
- Profit = Selling price - Cost price = Rs.560 - Rs.560 = Rs.0
Step 4: Calculate the % Profit
- % Profit = (Profit / Cost price) * 100
- % Profit = (0 / 560) * 100
- % Profit = 0%
Therefore, the correct option is 30%.
Revanth’s present age is three times his son’s present age and 4/5th of his father’s present age. The average of the present ages of all of them is 62 years. What is the difference between the Revanth’s son’s present age and Revanth’s father’s present age?- a)64 years
- b)69 years
- c)66 years
- d)62 years
Correct answer is option 'C'. Can you explain this answer?
Revanth’s present age is three times his son’s present age and 4/5th of his father’s present age. The average of the present ages of all of them is 62 years. What is the difference between the Revanth’s son’s present age and Revanth’s father’s present age?
a)
64 years
b)
69 years
c)
66 years
d)
62 years
|
|
Pk Academy answered |
Present age of Revanth is = 4/5x
Present age of Revanth’s father is = 4/15x
Ratio = 15: 12 : 4
Difference between the Revanth’s son’s present age and Revanth’s father’s present age = 62/31 * 3(15 – 4).
= 2*3*11 = 66 years.
Present age of Revanth’s father is = 4/15x
Ratio = 15: 12 : 4
Difference between the Revanth’s son’s present age and Revanth’s father’s present age = 62/31 * 3(15 – 4).
= 2*3*11 = 66 years.
Eight years ago, Pranathi’s age was equal to the sum of the present ages of her one son and one daughter. Five years hence, the respective ratio between the ages of her daughter and her son that time will be 7:6. If Pranathi’s husband is 7 years elder to her and his present age is three times the present age of their son, what is the present age of the daughter?- a)19 years
- b)27 years
- c)15 years
- d)23 years
Correct answer is option 'D'. Can you explain this answer?
Eight years ago, Pranathi’s age was equal to the sum of the present ages of her one son and one daughter. Five years hence, the respective ratio between the ages of her daughter and her son that time will be 7:6. If Pranathi’s husband is 7 years elder to her and his present age is three times the present age of their son, what is the present age of the daughter?
a)
19 years
b)
27 years
c)
15 years
d)
23 years
|
Gowri Basu answered |
Given data:
Pranathi's husband is 7 years elder to her
Pranathi's husband's present age = 3 * Son's present age
Let's assume:
Son's present age = x years
Daughter's present age = y years
Pranathi's present age = z years
Calculating Pranathi's husband's present age:
Pranathi's present age = x + y (as 8 years ago, Pranathi's age was equal to the sum of her son and daughter's present ages)
z = x + y
Pranathi's husband's present age = z + 7
Pranathi's husband's present age = (x + y) + 7
Pranathi's husband's present age = (x + y) + 7
Pranathi's husband's present age = x + y + 7
Pranathi's husband's present age = x + y + 7
Pranathi's husband's present age = 3x (as per the given data)
Therefore, 3x = x + y + 7
2x = y + 7
y = 2x - 7
Calculating the daughter's present age:
5 years hence, the ratio of daughter's age to son's age will be 7:6
(y + 5) / (x + 5) = 7 / 6
6(y + 5) = 7(x + 5)
6y + 30 = 7x + 35
6(2x - 7) + 30 = 7x + 35
12x - 42 + 30 = 7x + 35
12x - 12x = 35 - 30 + 42
0 = 47
This equation does not satisfy, so let's recheck the calculations.
Pranathi's husband is 7 years elder to her
Pranathi's husband's present age = 3 * Son's present age
Let's assume:
Son's present age = x years
Daughter's present age = y years
Pranathi's present age = z years
Calculating Pranathi's husband's present age:
Pranathi's present age = x + y (as 8 years ago, Pranathi's age was equal to the sum of her son and daughter's present ages)
z = x + y
Pranathi's husband's present age = z + 7
Pranathi's husband's present age = (x + y) + 7
Pranathi's husband's present age = (x + y) + 7
Pranathi's husband's present age = x + y + 7
Pranathi's husband's present age = x + y + 7
Pranathi's husband's present age = 3x (as per the given data)
Therefore, 3x = x + y + 7
2x = y + 7
y = 2x - 7
Calculating the daughter's present age:
5 years hence, the ratio of daughter's age to son's age will be 7:6
(y + 5) / (x + 5) = 7 / 6
6(y + 5) = 7(x + 5)
6y + 30 = 7x + 35
6(2x - 7) + 30 = 7x + 35
12x - 42 + 30 = 7x + 35
12x - 12x = 35 - 30 + 42
0 = 47
This equation does not satisfy, so let's recheck the calculations.
144 liters of the mixture contains milk and water in the ratio 5: 7. How much milk needs to be added to this mixture so that the new ratio is 23: 21 respectively?
- a)40 liters
- b)28 liters
- c)32 liters
- d)36 liters
Correct answer is option 'C'. Can you explain this answer?
144 liters of the mixture contains milk and water in the ratio 5: 7. How much milk needs to be added to this mixture so that the new ratio is 23: 21 respectively?
a)
40 liters
b)
28 liters
c)
32 liters
d)
36 liters
|
|
Charvi Banerjee answered |
Given:
Volume of mixture = 144 liters
Initial ratio of milk to water = 5:7
Final ratio of milk to water = 23:21
Solution:
Step 1: Finding the amount of milk and water in the initial mixture
Let the amount of milk in the mixture be 5x liters and the amount of water be 7x liters.
Therefore, 5x + 7x = 144
12x = 144
x = 12
So, the initial amount of milk = 5 * 12 = 60 liters
And the initial amount of water = 7 * 12 = 84 liters
Step 2: Adding milk to the mixture
Let the amount of milk to be added be y liters.
After adding y liters of milk, the total amount of milk becomes 60 + y liters.
Step 3: Finding the new ratio
According to the new ratio,
(60 + y) / 84 = 23 / 21
21(60 + y) = 23 * 84
1260 + 21y = 1932
21y = 672
y = 32
Therefore, 32 liters of milk needs to be added to the mixture so that the new ratio is 23:21.
Therefore, the correct answer is option c) 32 liters.
Volume of mixture = 144 liters
Initial ratio of milk to water = 5:7
Final ratio of milk to water = 23:21
Solution:
Step 1: Finding the amount of milk and water in the initial mixture
Let the amount of milk in the mixture be 5x liters and the amount of water be 7x liters.
Therefore, 5x + 7x = 144
12x = 144
x = 12
So, the initial amount of milk = 5 * 12 = 60 liters
And the initial amount of water = 7 * 12 = 84 liters
Step 2: Adding milk to the mixture
Let the amount of milk to be added be y liters.
After adding y liters of milk, the total amount of milk becomes 60 + y liters.
Step 3: Finding the new ratio
According to the new ratio,
(60 + y) / 84 = 23 / 21
21(60 + y) = 23 * 84
1260 + 21y = 1932
21y = 672
y = 32
Therefore, 32 liters of milk needs to be added to the mixture so that the new ratio is 23:21.
Therefore, the correct answer is option c) 32 liters.
A Boat going upstream takes 8 hours 24 minutes to cover a certain distance, while it takes 5 hours to cover 5/7 of the same distance running downstream. Then what is the ratio of the speed of boat to speed of water current?- a)11:5
- b)11:6
- c)11:1
- d)6:5
Correct answer is option 'C'. Can you explain this answer?
A Boat going upstream takes 8 hours 24 minutes to cover a certain distance, while it takes 5 hours to cover 5/7 of the same distance running downstream. Then what is the ratio of the speed of boat to speed of water current?
a)
11:5
b)
11:6
c)
11:1
d)
6:5
|
|
Pk Academy answered |
(S-R)*42/5 = (S+R)*7
S:R = 11:1
S:R = 11:1
A certain number of men take 45 days to complete work. If there are 10 men less then they will take 60 days to complete the work. Find the original number of men.- a)50
- b)60
- c)30
- d)40
Correct answer is option 'D'. Can you explain this answer?
A certain number of men take 45 days to complete work. If there are 10 men less then they will take 60 days to complete the work. Find the original number of men.
a)
50
b)
60
c)
30
d)
40
|
Nabanita Chopra answered |
Given Information:
- Let the original number of men be x.
- Time taken by x men to complete the work = 45 days.
- If there are 10 men less, i.e., (x-10) men, then they will take 60 days to complete the work.
Understanding the Problem:
- The rate at which work is completed is inversely proportional to the number of men working on it.
- More men, less time taken; fewer men, more time taken.
Solution Steps:
1. Formulating the Equations:
- Using the concept of work done by men, we can write the equations as:
- x * 45 = (x-10) * 60
2. Solving the Equation:
- Solving the equation:
- 45x = 60x - 600
- 600 = 15x
- x = 40
3. Final Answer:
- Therefore, the original number of men required to complete the work in 45 days is 40 men.
Hence, the correct answer is option 'D' (40).
- Let the original number of men be x.
- Time taken by x men to complete the work = 45 days.
- If there are 10 men less, i.e., (x-10) men, then they will take 60 days to complete the work.
Understanding the Problem:
- The rate at which work is completed is inversely proportional to the number of men working on it.
- More men, less time taken; fewer men, more time taken.
Solution Steps:
1. Formulating the Equations:
- Using the concept of work done by men, we can write the equations as:
- x * 45 = (x-10) * 60
2. Solving the Equation:
- Solving the equation:
- 45x = 60x - 600
- 600 = 15x
- x = 40
3. Final Answer:
- Therefore, the original number of men required to complete the work in 45 days is 40 men.
Hence, the correct answer is option 'D' (40).
In a class of 20 students, Shreya is 5 from the top and Annie is 7 ranks below Shreya. Find Annie’s rank from the bottom.- a)3
- b)5
- c)6
- d)9
- e)None of these
Correct answer is option 'D'. Can you explain this answer?
In a class of 20 students, Shreya is 5 from the top and Annie is 7 ranks below Shreya. Find Annie’s rank from the bottom.
a)
3
b)
5
c)
6
d)
9
e)
None of these
|
Rounak Kapoor answered |
Understanding the Problem
We have a class of 20 students, where Shreya holds a rank of 5 from the top. This means there are 4 students ranked above her.
Finding Shreya's Rank
- Shreya’s rank = 5 (from the top)
Calculating Annie's Rank
- Annie is ranked 7 positions below Shreya.
To find Annie’s rank:
- Annie's rank from the top = Shreya's rank + 7
- Annie's rank from the top = 5 + 7 = 12
Finding Annie's Rank from the Bottom
To determine Annie’s rank from the bottom, we can use the total number of students:
- Total students = 20
- Annie's rank from the bottom = Total students - Annie's rank from the top + 1
- Annie's rank from the bottom = 20 - 12 + 1 = 9
Conclusion
Thus, Annie’s rank from the bottom is 9. Therefore, the correct answer is:
Option D: 9
We have a class of 20 students, where Shreya holds a rank of 5 from the top. This means there are 4 students ranked above her.
Finding Shreya's Rank
- Shreya’s rank = 5 (from the top)
Calculating Annie's Rank
- Annie is ranked 7 positions below Shreya.
To find Annie’s rank:
- Annie's rank from the top = Shreya's rank + 7
- Annie's rank from the top = 5 + 7 = 12
Finding Annie's Rank from the Bottom
To determine Annie’s rank from the bottom, we can use the total number of students:
- Total students = 20
- Annie's rank from the bottom = Total students - Annie's rank from the top + 1
- Annie's rank from the bottom = 20 - 12 + 1 = 9
Conclusion
Thus, Annie’s rank from the bottom is 9. Therefore, the correct answer is:
Option D: 9
A Boat takes total 16 hours for traveling downstream from point A to point B and coming back point C which is somewhere between A and B. If the speed of the Boat in Still water is 9 Km/hr and the rate of stream is 6 Km/hr, then what is the distance between A and C?- a)60 Km
- b)90 Km
- c)30 Km
- d)Cannot be determined
Correct answer is option 'D'. Can you explain this answer?
A Boat takes total 16 hours for traveling downstream from point A to point B and coming back point C which is somewhere between A and B. If the speed of the Boat in Still water is 9 Km/hr and the rate of stream is 6 Km/hr, then what is the distance between A and C?
a)
60 Km
b)
90 Km
c)
30 Km
d)
Cannot be determined
|
|
Pk Academy answered |
16 = D/9+6 + x/9-6
Manoj can do a work in 20 days, while Chandu can do the same work in 25 days. They started the work jointly. A few days later Suresh also joined them and thus all of them completed the whole work in 10 days. All of them were paid total Rs.1000. What is the share of Suresh?- a)100
- b)300
- c)200
- d)400
Correct answer is option 'A'. Can you explain this answer?
Manoj can do a work in 20 days, while Chandu can do the same work in 25 days. They started the work jointly. A few days later Suresh also joined them and thus all of them completed the whole work in 10 days. All of them were paid total Rs.1000. What is the share of Suresh?
a)
100
b)
300
c)
200
d)
400
|
|
Milan Jain answered |
Given Data:
Manoj's efficiency = 1/20
Chandu's efficiency = 1/25
Together they completed the work in 10 days
Total payment = Rs.1000
Calculating Suresh's share:
Let Suresh's efficiency be x (work done by Suresh in 1 day)
Combined efficiency of Manoj, Chandu, and Suresh = 1/20 + 1/25 + x
Given that all three completed the work in 10 days:
(1/20 + 1/25 + x) * 10 = 1
Solving the equation, we get x = 1/50
Calculating Suresh's share of the payment:
Suresh worked for 10 days at an efficiency of 1/50
Therefore, Suresh's total work = 10 * 1/50 = 1/5
Total payment = Rs.1000
Suresh's share = (1/5) / 1 * 1000 = Rs.200
Therefore, the share of Suresh in the total payment of Rs.1000 is Rs.200. Hence, the correct answer is option 'A'.
Manoj's efficiency = 1/20
Chandu's efficiency = 1/25
Together they completed the work in 10 days
Total payment = Rs.1000
Calculating Suresh's share:
Let Suresh's efficiency be x (work done by Suresh in 1 day)
Combined efficiency of Manoj, Chandu, and Suresh = 1/20 + 1/25 + x
Given that all three completed the work in 10 days:
(1/20 + 1/25 + x) * 10 = 1
Solving the equation, we get x = 1/50
Calculating Suresh's share of the payment:
Suresh worked for 10 days at an efficiency of 1/50
Therefore, Suresh's total work = 10 * 1/50 = 1/5
Total payment = Rs.1000
Suresh's share = (1/5) / 1 * 1000 = Rs.200
Therefore, the share of Suresh in the total payment of Rs.1000 is Rs.200. Hence, the correct answer is option 'A'.
Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group?- a)YB
- b)AD
- c)IK
- d)MP
- e)WZ
Correct answer is option 'C'. Can you explain this answer?
Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group?
a)
YB
b)
AD
c)
IK
d)
MP
e)
WZ
|
|
Pk Academy answered |
Remaining pairs have 2 letters between them
Shas married 8 year ago. Today her age is 9/7 times to that time of marriage. At present his son’s age is 1/6th of her age. What was her son’s age 3 year ago?- a)4 yr
- b)2 yr
- c)3 yr
- d)5 yr
Correct answer is option 'C'. Can you explain this answer?
Shas married 8 year ago. Today her age is 9/7 times to that time of marriage. At present his son’s age is 1/6th of her age. What was her son’s age 3 year ago?
a)
4 yr
b)
2 yr
c)
3 yr
d)
5 yr
|
|
Pk Academy answered |
Let us assume that Sravan’s age 8 year ago = x
Present age = x + 8
x + 8 = 9/7 x
7(x + 8)= 9x
x = 28; 28 + 8 = 36
Son’s age = 1/6 * 36 = 6
Son’s age 3 year ago = 6-3 =3
Present age = x + 8
x + 8 = 9/7 x
7(x + 8)= 9x
x = 28; 28 + 8 = 36
Son’s age = 1/6 * 36 = 6
Son’s age 3 year ago = 6-3 =3
Karuna is sitting 25th from the left end and Preeti is sitting 26th from the right end. Preeti is at 20th to the left of Karuna. What is the total number of students sitting in the row?- a)21
- b)32
- c)26
- d)28
- e)30
Correct answer is option 'E'. Can you explain this answer?
Karuna is sitting 25th from the left end and Preeti is sitting 26th from the right end. Preeti is at 20th to the left of Karuna. What is the total number of students sitting in the row?
a)
21
b)
32
c)
26
d)
28
e)
30
|
|
Pk Academy answered |
Karuna is 25th from the left end and Preeti is 20th to left of Karuna so Preeti is 5th from the left end and given 26th from the right end, so total = (5+26) – 1 = 30
Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group?- a)Win
- b)Compete
- c)Triumph
- d)Victory
- e)Succeed
Correct answer is option 'B'. Can you explain this answer?
Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group?
a)
Win
b)
Compete
c)
Triumph
d)
Victory
e)
Succeed
|
Rajesh Roy answered |
Explanation:
Grouping:
- Win, Triumph, Victory, and Succeed are all related to achieving success or coming out on top in a competition or endeavor.
- Compete, on the other hand, is the process of striving against others in a competition, rather than the outcome of winning or succeeding.
Therefore, the odd one out is Compete (option B) as it does not directly relate to the outcome of success or victory.
Grouping:
- Win, Triumph, Victory, and Succeed are all related to achieving success or coming out on top in a competition or endeavor.
- Compete, on the other hand, is the process of striving against others in a competition, rather than the outcome of winning or succeeding.
Therefore, the odd one out is Compete (option B) as it does not directly relate to the outcome of success or victory.
Judge: Court:: Doctor:?- a)Municipality
- b)Hospital
- c)Tehsil
- d)Factory
- e)None of these
Correct answer is option 'B'. Can you explain this answer?
Judge: Court:: Doctor:?
a)
Municipality
b)
Hospital
c)
Tehsil
d)
Factory
e)
None of these
|
|
Codebreakers answered |
The judge sits in court similarly doctor sits in a hospital
Rita is sitting 5th from the left end of the row and Sita is 11th to the right of Rita with Tina being 4th to left of Sita. Madhuri is 8th to the right of Tina. What is the total number of students in the row if Madhuri is sitting at the extreme end?- a)20
- b)28
- c)23
- d)33
- e)12
Correct answer is option 'A'. Can you explain this answer?
Rita is sitting 5th from the left end of the row and Sita is 11th to the right of Rita with Tina being 4th to left of Sita. Madhuri is 8th to the right of Tina. What is the total number of students in the row if Madhuri is sitting at the extreme end?
a)
20
b)
28
c)
23
d)
33
e)
12
|
|
Codebreakers answered |
Rita is 5th from left, Sita 11th to the right of Rita, so 16th from the left end, Tina is 4th to left of Sita so Tina is 12th from the left end. Now Madhuri is 8th to the right of Tina, this means 20th from left, so 20 students
Cost price of 80 notebooks is equal to the selling price of 65 notebooks. The gain or loss % is- a)32%
- b)42%
- c)27%
- d)23%
Correct answer is option 'D'. Can you explain this answer?
Cost price of 80 notebooks is equal to the selling price of 65 notebooks. The gain or loss % is
a)
32%
b)
42%
c)
27%
d)
23%
|
|
Codebreakers answered |
% = [80 – 65/65]*100
= 15*100/65 = 1500/65
= 23.07 = 23% profit
Therefore, the gain percentage is 23%.
= 15*100/65 = 1500/65
= 23.07 = 23% profit
Therefore, the gain percentage is 23%.
In a group of 8 boys, 2 men aged at 21 and 23 were replaced, two new boys. Due to this the average cost of the group increased by 2 years. What is the average age of the 2 new boys?- a)17
- b)30
- c)28
- d)23
Correct answer is option 'B'. Can you explain this answer?
In a group of 8 boys, 2 men aged at 21 and 23 were replaced, two new boys. Due to this the average cost of the group increased by 2 years. What is the average age of the 2 new boys?
a)
17
b)
30
c)
28
d)
23
|
|
Pk Academy answered |
According to the given data
Average of 8 boys increased by 2, this means the total age of boys increased by 8*2 = 16 yrs
So sum of ages of two new boys = 21+23+16 = 60
Average of these = 60/2 = 30
Average of 8 boys increased by 2, this means the total age of boys increased by 8*2 = 16 yrs
So sum of ages of two new boys = 21+23+16 = 60
Average of these = 60/2 = 30
Statements:
I. The bank decided to give advances to the priority sector at the rate of interest at par with the corporate sector.
II. The percentage of bad loans given by the banks to the priority sector is very low compared to the corporate sector.- a)I is the cause and II is its effect.
- b)II is the cause and I is its effect.
- c)Both I and II are independent causes.
- d)Both I and II are effects of independent causes.
- e)Both I and II are effects of some common causes.
Correct answer is option 'D'. Can you explain this answer?
Statements:
I. The bank decided to give advances to the priority sector at the rate of interest at par with the corporate sector.
II. The percentage of bad loans given by the banks to the priority sector is very low compared to the corporate sector.
I. The bank decided to give advances to the priority sector at the rate of interest at par with the corporate sector.
II. The percentage of bad loans given by the banks to the priority sector is very low compared to the corporate sector.
a)
I is the cause and II is its effect.
b)
II is the cause and I is its effect.
c)
Both I and II are independent causes.
d)
Both I and II are effects of independent causes.
e)
Both I and II are effects of some common causes.
|
|
Codebreakers answered |
The bank can change its policy with the priority sector due to a change in government policy. Thus, it is an effect. But the same cause cannot be the reason for the percentage of bad loans being less for the priority sector.
While calculating the weight of a group of men, the weight of 63 kg of one of the member was mistakenly written as 83 kg. Due to this the average of the weights increased by half kg. What is the number of men in the group?- a)25
- b)20
- c)40
- d)60
Correct answer is option 'C'. Can you explain this answer?
While calculating the weight of a group of men, the weight of 63 kg of one of the member was mistakenly written as 83 kg. Due to this the average of the weights increased by half kg. What is the number of men in the group?
a)
25
b)
20
c)
40
d)
60
|
|
Pk Academy answered |
Increase in marks lead to an increase in average by 1/2
So (83-63) = x/2
x = 40
Therefore, the number of men in the group are 40
So (83-63) = x/2
x = 40
Therefore, the number of men in the group are 40
An alloy contains Brass, Iron, and Zinc in the ratio 2:3:1 and another contains Iron, zinc, and lead in the ratio 5:4:3. If equal weights of both alloys are melted together to form a third alloy, then what will be the weight of lead per kg in new alloy?- a)1/4
- b)41/7
- c)1/8
- d)51/9
Correct answer is option 'C'. Can you explain this answer?
An alloy contains Brass, Iron, and Zinc in the ratio 2:3:1 and another contains Iron, zinc, and lead in the ratio 5:4:3. If equal weights of both alloys are melted together to form a third alloy, then what will be the weight of lead per kg in new alloy?
a)
1/4
b)
41/7
c)
1/8
d)
51/9
|
|
Pk Academy answered |
Shortcut:
In the first alloy,
2:3:1 =6*2
5:4:3 =12
Multiply 2 to make it equal,
4:6:2
5:4:3
Adding all,
4:11:6:3=24
their are 3 parts of lead in 24 parts of whole mixture
3/24=1/8
In the first alloy,
2:3:1 =6*2
5:4:3 =12
Multiply 2 to make it equal,
4:6:2
5:4:3
Adding all,
4:11:6:3=24
their are 3 parts of lead in 24 parts of whole mixture
3/24=1/8
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