6. 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 the weight of B is:
A.26 kg
B. 31 kg
C. 17 kg
D. 20 kg
6. 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 the weight of B is:
A.26 kg
B. 31 kg
C. 17 kg
D. 20 kg