The average weight of A, B and C is 46 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:
Choose the correct choice:
A) 28 kg B) 32 kg C) 33 kg D) 34 kg E) None of these
Explanation:   Let A, B, C represent their respective weights. Then, we have:   A + B + C = (46 x 3) = 138 …. (i)   A + B = (40 x 2) = 80 …. (ii)   B + C = (43 x 2) = 86 ….(iii)   Adding (ii) and (iii), we get: A + 2B + C = 166 …. (iv)   Subtracting (i) from (iv), we get : B = 28.   B’s weight = 28 kg.   28 kgnswer: 28 kg
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The average weight of A, B and C is 46 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: