Question

The average age of three brothers is 15 years. If the age of two brothers is 15 years and 12 years find the age of third brother.​

Answer 1

given that

the average age of 3 brother is 15

age of two brother  is 15 yr and 12 yr

let the age of third brother be x

A/Q

⇒ (15+12+x)/3= 15

⇒27x/3 =15

⇒ 27x = 45

⇒ x = 45/27

⇒ x = 5/3

the age of third is 5/3

hope this will help you

Answer 2

Let age of third brother be x.
So, (15 + 12 + x)/3 = 15
27 + x = 45
x= 18