Question

the average age of three boys is 15 years if their age are in ratio of 3 : 5 : 7 find the age of the youngest boy ​

Answer 1

Step-by-step explanation:

Let the ages be 3x 5x and 7x

Atq,

Avg. Ages = 15

Therefore

(3x + 5x +7x )/3 = 15

15x = 15*3 = 45

X = 45/15 = 3

Therefore

Age of youngest boy

= 3x

= 3*3

= 9 years