The average weight of A, B and C is 60 kg. If the average weight of A and B be 70 kg and that of B and C be 50 kg, then the weight of B is:  Choose the correct option:	A) 50 kg	B) 60 kg	C) 55 kg	D) 57 kg	E) 62 kg
EXPLANATION   Let A, B, C represent their respective weights. Then, we have:   A + B + C = (60 x 3) = 180 â€¦. (i)   A + B = (70 x 2) = 140 â€¦. (ii)   B + C = (50 x 2) = 100 â€¦.(iii)   Adding (ii) and (iii), we get: A + 2B + C = 240 â€¦. (iv)   Subtracting (i) from (iv), we get : B = 60.   Bâ€™s weight = 60 kg.   Answer 60 kg
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The average weight of A, B and C is 60 kg. If the average weight of A and B be 70 kg and that of B and C be 50 kg, then the weight of B is: