NCHMCT JEE 2014 Question Paper with solutions for online practice

Sum of ages of A, B and C
= 18 × 3 = 54 years
Let B is x year old
then A is (x – 2) year old
and C is (x + 5) year old
from question,
x + x – 2 + x + 5 = 54
3x = 51
x = 17
Hence, age of C = x + 5 = 22 years.