LIC AAO 06 Mar 2016 Paper

A’s present age = 2x years
B’s present age = 3x years
According to the question,
3x +21 =2 (2x + 6)
⇒ 3x+21 = 4x+ 12
⇒ 4x - 3x = 21 - 12
⇒ x = 9 years
= Difference between present ages of A and B