Let Sohan’s present age be x years and his father’s present age be y years. Now, 4 (x - 4) = (y - 4) ⇒ 4x - 16 = y - 4 4x - y = 12 …(1) Again, 2(x + 16) = y + 16 ⇒ 2x + 32 = y + 16 2x - y = -16 …(2) Solving equation (1) and (2), 4x - y = 12 2x - y = - 16 2x = 28 x = 14 x = 14, y = 44 ∴ Present average age =