The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg....... [CLOSED]

Question

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then what is the weight of B?

Answer 1

A+B+C=135
A+B=80
80+C=135
C=135-80
C=55
B+C=86
B+55=86
B=86-55
B=31