Question

The avarge boys of 15 years. If their ages aur in the ratio 3:5:7 find the age of youngest boy?

Answer 1

Average age of the 3 boys = 15 years old

Total age of the 3 boys = 15 x 3 = 45 years old

Ratio of their age = 3 : 5 : 7

Total parts = 3 + 5 + 7 = 15

15 parts = 45 years old

Find 1 part:

1 part = 45 ÷ 15 = 3

Find 3 parts (youngest boy):

3 parts = 3 x 3 = 9 years old

Answer: 9 years old