Question

The average age of three brothers is 15 years. If the age of two brothers is15yrs and 12yrs, find the age of the third brother.

Answer 1

let the ages of all the three brothers be A, B and C respectively,

then according to the question, we have

(A+B+C)/3 = 15,


A+B+C=15×3,


A+B+C=45,...............eq(1),


given

A=15 yrs,

B=12 yrs,


therefore

from eq(1), we get


15+12+C=45,


27+C=45,


then

C=45-27,

C=18 yrs

Answer 2

Answer:

18 is the correct answer

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