The average weight of A, B and C is 30 kg. If the average weight of A and B be 25 kg and that of B and C be 28 kg, then the weight of B is:  Pick:  A) 14 kg  B) 15 kg  C) 18 kg  D) 19 kg  E) 16 kg
EXPLANATION   Let A, B, C represent their respective weights. Then, we have:   A + B + C = (30 x 3) = 90 â€¦. (i)   A + B = (25 x 2) = 50 â€¦. (ii)   B + C = (28 x 2) = 56 â€¦.(iii)   Adding (ii) and (iii), we get: A + 2B + C = 106 â€¦. (iv)   Subtracting (i) from (iv), we get : B = 16.   Bâ€™s weight = 16 kg.   Answer 16 kg
<result>E</result>
The average weight of A, B and C is 30 kg. If the average weight of A and B be 25 kg and that of B and C be 28 kg, then the weight of B is: