Page 231 - Start Up Mathematics_6

Therefore, the ratio of:
(a) present age of Priya to her mother’s age = 12 : 36 = 1 : 3

(b) present age of Priya’s father to the age of her mother = 42 : 36 = 7 : 6
(c) age of Priya’s mother when Priya’s age was 10 years = 36 – 2 = 34 years
∴ required ratio = 10 : 34 = 5 : 17
(d) age of father to the age of mother 10 years ago = 32 : 26 = 16 : 13

EXERCISE 12.1

1. There are 16 girls and 24 boys in a class. What is the ratio of number of boys to the number
of girls?

2. Rizwan drives his car at a speed of 60 km per hour whereas Ravi drives his car at the speed of
45 km per hour. Find the ratio of the speed of Ravi’s car to Rizwan’s car.
3. Nishi has 4 pairs of white earrings and 5 pairs of red earrings. What is the ratio of white
earrings to the total number of pairs of earrings?
4. A tempo travels 60 km in 2 hours and a car travels 80 km in 1 hour. Find the ratio of their
speed.

5. Which ratio is greater: 3 : 17 or 5 : 51?
6. Find the ratio of the following:

(a) 15 minutes to 1.5 hours (b) 25 cm to 2.5 m (c) 60 paise to ` 1 (d) 400 mL to 1.6 L
7. Reema has 24 cups and 18 saucers. Find the ratio of the following in the simplest form:

(a) Cups to saucers (b) Saucers to cups
(c) Cups to the whole crockery (d) Saucers to the whole crockery
8. In a sports academy there are 30 cricket players and 20 football players getting training.
Find the ratio of the following in the simplest form:

(a) Football players to cricket players (b) Cricket players to football players
(c) Football players to all players (d) Cricket players to all players

9. Mr. Pillai earns ` 18,000 per month. He spends ` 12,000 and saves the rest. Find the ratio
of the following in the simplest form:
(a) His income to expenditure (b) His expenditure to savings

(c) His savings to income (d) His earning to savings
10. The present age of a father is 36 years and that of his son is 8 years. Find the ratio of:

(a) present age of father to the present age of son.
(b) age of father to the age of son, when son was 6 years old.
(c) age of father to the age of son after 10 years.

(d) age of father to the age of son when father was 30 years old.
11. Mother wants to divide ` 460 between her daughters Shilpa and Payal in the ratio of their
ages. If Shilpa is 12 years old and Payal is 8 years old, find how much Shilpa and Payal
will get.

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