Q.1. Find the ratio of (in lowest from) :
(a) 200g to 4 Kg
(b) 80 Paise to ₹2
(c) 30 days to 36 hours
Ans. (a) 1 : 20
(b) 2 : 5
(c) 20 : 1
Q.2. If 3 : x :: 9 : 15 then find the value of x.
Ans. x = 5
Q.3. Express the following percents as the decimal fraction : (a) 0.07%
(b) 15%
Ans. (a) 0.0007
(b) 0.15
Q.4. Express each of the following percents as fraction in the simplest form :
(a)
(b) 75%
Ans.
(a)
(b)
Q.5. Express each of the following fractions as percent :
(a)
(b)
Ans. (a) 525%
(b) 45%
Q.6. Find 20% of ₹2500.
Ans. ₹500
Q.7. Find the whole quantity if 40% of it is 500 km
Ans. 1250 km
Q.8. In the market cost of 1 dozen bananas are ₹48. Find the cost of 10 bananas.
Ans. ₹40
Q.9. If the ratio of angles of a triangle is 2:3:4, then find the measure of these angles.
Ans. 40°, 60°, 80°
Q.10. If 75% of x is 18 then find the value of x.
Ans. x = 24
Q.11. Chalk contains Calcium, Carbon and Oxygen in the ratio 10:3:12. Find the percentage of Carbon in chalk.
Ans. 12%
Q.12. In a city, 35% are females, 45% are males and remaining are children. What % are children?
Ans. 20%
Q.13. Compute the Simple Interest on a sum of ₹ 900 for 5 years at the ratio of 6% per annum.
Ans. ₹270
Q.14. The cost price of 8 books is equal to the selling price of 6 books. Find the gain percent.
Ans.
Q.15. What principal will amount to ₹ 900 in 6 years at 10% Simple Interest?
Ans. ₹562.50
Q.16. There are 120 children live in Seemapuri 'J' Black. Accorching to servery conducted in 2014, out of these 24 children do not go to school" Under the project "School Chale Hum" these students admitted in school on the basis of above statement answer the following questions.
(a) In 2014, how many children did not go to school?
(b) Under the Project "School Chale Hum" How many children admitted in school.
Ans. (a) 20%
(b) 100%
121 videos351 docs45 tests

1. What is the concept of comparing quantities in mathematics? 
2. How can we compare two quantities using ratios and proportions? 
3. What are the different methods of comparing quantities? 
4. How can we compare quantities in reallife situations? 
5. What are some common mistakes to avoid when comparing quantities? 
121 videos351 docs45 tests


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