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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 (in kg) of B is
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- 20
- 26
- 31
- 17
- 20
Correct Option: C
Weight of B = (A + B)’s weight + (B + C)’s weight – (A + B + C)’s weight
Weight of B = 40 × 2 + 43 × 2 – 45 × 3
Weight of B = 80 + 86 – 135
Weight of B = 166 – 135 = 31 kg.
