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In an election, each voter may vote for two candidates. Half of the voters vote for A, but divide their votes between B, C and D in the ratio of 3 : 2 : 1. Of the remaining, half vote for B and divides their votes between C and D in the ratio of 2 : 1. Of the remaining, half vote for C and D and the remaining 840 do not vote for anyone. How many votes were received by A, B, C and D respectively?
Best way of solving this question is  Go through the options.
In a forest reserve, the ratio of the number of deers, bear and fox is 3 : 7 : 5. If the difference between the number of deers and bears is a multiple of 3 as well as 7, what is the minimum number of animals in the park?
► No. of deers, bears and foxes = 3x : 7x : 5x
► Difference between the no. of deers and bears = 4x Now, 4x has to be a multiple of 21. So, x has to be a multiple of 21.
► So, Total number of animals = 15x = 15 * 21 = 315
Shalaj and Associates, a shoemanufacturing company, has three machines producing shoes. If machine X produces l/4th as many as machine Y produces in the same time, and machine Y produces twice as many as machine Z produces in the same time, then during a fixed time, what fraction of the total number of shoes is produced by machine Z?
► Assume that Y produces 4P units in unit time.
► Then X and Z produce P and 2P units in the same time.
► So, Total shoes produced = 7P, Fraction of the total number of shoes produced by machine Z = 2/7
The inhabitants of Hawaii Island are taxed in a peculiar manner. They have to pay a fixed sum irrespective of their income strata. In addition to this they have to pay an amount which is proportional to the excess of their salary over Rs 50,000. Mr Kalyan pays a total tax of Rs 6,200 when his annual salary is Rs 6,0000 and his wife Mrs. Kalyan pays a total tax of Rs 7,700 when her annual salary is Rs 75,000. What is the yearly salary of Mr Ajay who pays an annual tax of Rs 8,200?
Tax = Fixed + Variable
► Since Mr Kalyan pays Rs 6200 and Mrs Kalyan pays Rs 7700, so it can be inferred that for Rs 10,000 (Difference between their salaries), one has to pay Rs 1500 as the variable tax.
► So, Fixed component of tax = Rs 5200. The point worth to be noted here is the fact that tax is to be paid over an above Rs 50,000.
► So, the variable tax percentage above Rs 50,000 = 10%. Now the answer can be calculated using options.
The total profit made by running a train between New Delhi to Lucknow consists of two parts: (i) a constant amount of Rs 24 lakh per trip and (ii) it varies as the square of the number of coaches attached to the engine that amounts to Rs 7P^{2}, where P is the number of coaches attached to the engine in the trip. If the average profit per coach per trip should not fall below Rs 169 lakh, then what is the minimum number of coaches that have to be attached to the engine?
Total profit = Rs 24 lakh per trip + Rs 7P^{2}, where P is the number of coaches.
Now go through the options.
The average weight of the fifty students in a class is 40 kg. If 5 students of average weight 42 kg and 15 students of average weight 45 kg are added into the same class, find the new average weight of the class.
Given:
The average weight of the 50 students = 40 kg.
5 students of average weight 42 kg and 15 students of average weight 45 kg are added.
Formula used:
Average weight = Total weight/Total number of people
Calculation:
Total weight of 50 students = 50 × 40 = 2000 kg
Total weight of 5 students = 5 × 42 = 210 kg
Total weight of 15 students = 15 × 45 = 675 kg
Total weight of 70 students = 2000 + 210 + 675 = 2885 kg
The average weight of 70 students = 2885/70 = 41.21 kg
∴ new average weight of the class is 41.21 kg.
The speed of man while walking, running and driving are in the ratio of 1:3:9. If he travels equal distance while walking, running and driving, what is the ratio
► Assume the distance = 9 units.
► So, the ratio of the time taken = 9:3:1
So, the answer = (9/1):(3/3):(1/9)
⇒ 81:9:1
The time period of oscillation T for a pendulum is given
where l is the length of the pendulum and g is the acceleration due to gravity, ‘k’ is any const. If ‘k’ and ‘g’ remain unchanged under any condition, what should be the percentage change in l such that the time period T increases by 10%?
T = 2π * (√l/g)
T increases by 10%, new time period 0.1T
(1T + 0.1T) = 2π * (√l/g)
1.1T = 2π * (√l/g)
i.e 21% increase in the length of the pendulum.
In the famous Hawthorne studies by Elton Mayo, employees of the organization were given the options of going to several places for entertainment. Oneseventh of the employees preferred to go to the polo ground, a number equal to the square root of the remaining employees went to the museum. Onefifth of the remaining employees went to the fair. Onethird of the remaining to the science exhibition and the rest to watch movie ASHOKA. which was running house full in the nearby theatre. The total number of employees who went to the polo ground and the museum is twice that of the employees who went to the fair.
Q.The entry tickets for museum, fair, exhibition and the movie were Rs 5, Rs 4, Rs 2 and Rs 25 respectively. How much money did the employees pay for all these on that Sunday?
Read the passage below and solve the questions based on it.
On 13th of November, I kept some money in a magical purse in which on even every alternate day starting from the 13th, money increases with respect to the closing amount on the evening of the previous day, that the ratio of money becomes 2 : 1 but on every alternate day starting from the 14th, the money decreases by Rs 10. when compared to the closing amount on the evening of the previous day I had Rs 500 on the 19th and the magical purse kept on multiplying money for me till the 25th of that November.
Q. How much money was there on the 22nd of November?
It is Rs 970 on 22nd.
Price of each article of type P, Q, and R is Rs. 300, Rs. 180 and Rs. 120 respectively. Suresh buys articles of each type in the ratio 3:2:3 in Rs. 6480. How many articles of type Q did he purchase?
► Let the common factor be k.
► Hence, the number of articles of type P, Q and R will be 3k, 2k and 3k respectively
► Also, Unit price of article x Number of articles = Total amount for the articles
∴ 300 x 3k + 180 x 2k + 120 x 3k = 6480
⇒ k = 4
∴ Number of articles of Type Q = 2k = 8
Read the passage below and solve the questions based on it.
In a class, every student plays exactly one of the following games—squash, table tennis, hockey, handball, cricket. Exactly 1/ 12^{th} of the girls and 1/8^{th} of the boys play squash. 1/15^{th} of the girls and 1/6^{th} of the boys play hockey, 1/4^{th} of the girls and 1/12^{th} of the boys play handball. 1/5^{th} of the girls and 3/8^{th} of the boys plays table tennis and the remaining boys and girls play cricket. The total strength of the class is less than 120
Q. How many girls are there in the class?
► Whatever is the total number of boys, it should be divisibie by 8, 6, 12
► For total number of girls should be divisible by 12, 15 and 4, Now use options.
Read the passage below and solve the questions based on it.
In a class, every student plays exactly one of the following games—squash, table tennis, hockey, handball, cricket. Exactly 1/ 12^{th} of the girls and 1/8^{th} of the boys play squash. 1/15^{th} of the girls and 1/6^{th} of the boys play hockey, 1/4^{th} of the girls and 1/12^{th} of the boys play handball. 1/5^{th} of the girls and 3/8^{th} of the boys plays table tennis and the remaining boys and girls play cricket. The total strength of the class is less than 120
Q. Which of the following cannot be the ratio of boys and girls in the class?
► Whatever is the total number of boys, it should be divisibie by 8, 6 and 12
► For total number of girls should be divisible by 12, 15 and 4, Now use options.
The expenses of a hostel are partly fixed and partly variable with the number of boarders. When there are 50 boarders the charge is Rs. 48 per head and when there are 30 boarders the charge is Rs. 60 per head. Find the charges when there are 120 boarders?
► Let, F = Fixed Cost, K = variable cost, B= No of boarders, E= Total Expenditure
► Then, E= F + KB
⇒ 2400 = F + K50
⇒ 1800 = F + K30
⇒ K= 30, F = 900
► When there are 120 boarders the charge will be
⇒ E = 900 + 30(120)
⇒ E= 4500
Charge per boarder = 4500/120 = 37.5
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