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The average weight of A, B, C is 45kg. if the average weight of A and B be 40 kg and that of B and C be 40kg and that of B and C be 43kg, then the weight of B is ?
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- 17kg
- 20kg
- 26kg
- 31kg
Correct Option: D
weight of (A + B ) = (2 X 40 ) Kg = 80 kg
weight of (B + C ) = (2 X 43) kg = 86 kg
weight of (A + 2B +C ) = (80 + 86) kg = 166 kg
weight of (A + B + C ) = (3 X 45) kg = 135 kg
weight of B = (166-135) kg = 31 kg
