The average weight of A, B and C is 45 kg. If the average weight of A and B be 41 kg and that of B and C be 43 kg, then the weight of B is: Choose the correct choice.
A) 33 kg  B) 31 kg  C) 32 kg  D) 36 kg  E) 37 kg
A   33 kg   Let A, B, C represent their respective weights.   Then, we have: A + B + C = (45 x 3) = 135 .... (i)   A + B = (41 x 2) = 82 .... (ii)   B + C = (43 x 2) = 86 ....(iii)   Adding (ii) and (iii), we get: A + 2B + C = 168 .... (iv)   Subtracting (i) from (iv), we get : B = 33.   B's weight = 33 kg.   33 kg
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The average weight of A, B and C is 45 kg. If the average weight of A and B be 41 kg and that of B and C be 43 kg, then the weight of B is: