### 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.** 17 kg.

**B.** 20 kg.

**C.** 26 kg.

**D.** 31 kg.

## Show Answer

### Answer-D

Solution-

__Solution(By Apex Team)__

Let A, B, C represent their respective weights. Then, we have:
A + B + C = (45 x 3) = 135 …. (i)
A + B = (40 x 2) = 80 …. (ii)
B + C = (43 x 2) = 86 ….(iii)
Adding (ii) and (iii), we get: A + 2B + C = 166 …. (iv)
Subtracting (i) from (iv), we get : B = 31
Therefore B’s weight = 31 kg.