Question

the average age of three brother is 15 years ago the age of to brother in 15 years and 12 years find the age of the third brother​

Answer 1

answer

18

explanation

Let the total age of brothers be 'y'

Let the age of 3rd brother be 'x'

ATQ

15 = y/3

y = 45 years

Total age = 45 years

15 + 12 + x = 45

27 + x = 45

x = 18 years

Age of the 3rd brother is 18 years.

Answer 2

Answer:

Age of two brothers is 12 and 15 years.

Let age of third brother be x.

Here,

Average = sum of the 3 brothers' age/3

       15   = 12 + 15 + x / 3

       45  = 27 + x

Therefore

x = 45 - 27

  = 18 years

The age of the third brother is 18 years.

Hope it will help you.....