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 getP + 2Q + R = 1842Q = 184 (P + R) …(4)Solving (1) and (4),2Q = 184 - (156 - Q)2Q = 184 - 156 + Q Q = 28 years