Total age of P + Q + R = (52 × 3) years = 156 years …(1) Age of P + Q = (45 × 2) years = 90 years …(2) Age of Q + R = (47 × 2) years = 94 years …(3) Adding (2) and (3), we get P + 2Q + R = 184 2Q = 184 (P + R) …(4) Solving (1) and (4), 2Q = 184 - (156 - Q) 2Q = 184 - 156 + Q Q = 28 years