1.  The average weight of three boys A, B and C is 163/3 kg, while the average weight of three boys B, D and E is 53 kg. What is the average weight of A, B, C, D and E ?
A. 52.4 kg
B. 53.2 kg
C. 53.8 kg
D. Data inadequate
E. None of these

Answer: Option D

Explanation:

Total weight of (A + B + C) = (163/3 x 3) kg
= 163 kg.

Total weight of (B + D + E) = (53 x 3) kg
= 159 kg.

Adding both, we get : A + 2B + C + D + E
= (163 + 159) kg = 322 kg.

So, to find the average weight of A, B, C, D and E, we ought to know B's weight, which is not given.

So, the data is inadequate.