The average weight of A, B and C is 43 kg. If the average weight of A and B be 48 kg and that of B and C be 42 kg, then the weight of B is:	Select the correct option.
A) 55 kg B) 53 kg C) 49 kg D) 52 kg E) 51 kg
EXPLANATION   Let A, B, C represent their respective weights. Then, we have:   A + B + C = (43 x 3) = 129 â€¦. (i)   A + B = (48 x 2) = 96 â€¦. (ii)   B + C = (42 x 2) = 84 â€¦.(iii)   Adding (ii) and (iii), we get: A + 2B + C = 180 â€¦. (iv)   Subtracting (i) from (iv), we get : B = 51.   Bâ€™s weight = 51 kg.   Answer 51 kg
<result>E</result>
The average weight of A, B and C is 43 kg. If the average weight of A and B be 48 kg and that of B and C be 42 kg, then the weight of B is: