Chapter 11.Ratio and Proportion

1.Which of the following statements about ratio is true?

• a. A ratio is a comparison of two or more quantities.

• b. A ratio is only used in geometry.

• c. A ratio is always a whole number.

• d. A ratio is only used in algebra.

Answer explanation

The correct statement about ratio is that it is a comparison of two or more quantities (choice a).

2. What is the ratio of apples to oranges in a basket containing 12 apples and 8 oranges?

• a. 3:2

• b. 4:3

• c. 2:3

• d. 3:4

Answer explanation

The ratio of apples to oranges in the basket is 3:2. This means that for every 3 apples, there are 2 oranges. Therefore, the correct answer is a. 3:2.

3. The ratio of boys to girls in a class is 3:5. If there are 24 boys, how many girls are there?

• a. 12

• b. 15

• c. 30

• d. 40

4. An electrician takes 6 hours to complete a job. If 3 electricians work together, how long will it take them?

• a. 2 hours

• b. 3 hours

• c. 6 hours

• d. 18 hours

5.If the price of 6 oranges is ₹4.50, what is the price of 10 oranges?

• ₹77.5

• ₹7.5

• ₹10

• ₹18

6. If 4 pens cost $5.60, how much would 12 pens cost?

• a. $13.60

• b. $15.20

• c. $16.80

• d. $20.80

7. Sarah earns $15 for every hour she works. How much will she earn if she works for 9 hours?

• a. $90

• b. $105

• c. $135

• d. $150

8. The ratio of the length to the width of a rectangle is 4:3. If the length is 20 cm, what is the width?

• a. 5 cm

• b. 15 cm

• c. 25 cm

• d. 60 cm

9.The ratio of the ages of Amy and Beth is 2:5. If Amy is 10 years old, how old is Beth?

• a.10

• b.20

• c.15

• d.25

10.The ratio of red marbles to blue marbles is 4:5.If there are 36 red marbles, how many blue marbles are there?

• a. 16

• b. 32

• c. 45

• d. 50