Average Practice Test 2

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