A B and C average is 45, B and C average is 40 then find B=?

A) 41

B) 31<

C) 51

D) None of these

Explanation:

A+B+C = 45*3= 135Kg……….(i)
A+B = 40*2 = 80 Kg    ……….(ii)
B+C = 43*2 = 86 Kg    ……….(iii)
from i and ii
C= 55Kg                   ………..(iv)
from iii and iv
B = 31 Kg