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The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is :
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- 31 kg.
- 32 kg.
- 29.5 kg.
- 35 kg
- 31 kg.
Correct Option: A
B’s weight = (A + B)’s weight + (B + C)’s weight – (A + B + C)’s weight
B’s weight = (40 × 2 + 2 × 43 – 45 × 3) kg.
B’s weight = (80 + 86 – 135) kg.
B’s weight = 31 kg.
