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Average weight of P and Q is 32 kg. Average weight of Q and R is 43 kg. Average weight of P and R is 51 kg. What is the average weight (in kg) of P, Q and R?1). 442). 423). 404). 38 |
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Answer» ? Average WEIGHT of P and Q is 32 kg ⇒ Sum of their weight = 2 × 32 = 64 ⇒ P + Q = 64 kg (1) Similarly, Q + R = 86 kg (2) P + R = 102 kg (3) Adding EQUATION (1), (2) and (3) 2P + 2Q + 2R = 64 + 86 + 102 = 252 ⇒ P + Q + R = 126 kg ∴ Average weight of P, Q and R = (P + Q + R)/3 = 126/3 = 42 kg |
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