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The average weight of A ,\ B and C is...

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: (a) 17 kg (b) 20 kg (c) 26 kg (d) 31 kg

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