A. 30 kg

B. 35 kg

C. 42.5 kg

D. 37.25 kg

### Solution(By Apex Team)

The total weight of (36 + 44) Students of A and B, = (36 × 40 + 44 × 35) kg = 2980 kg. Therefore average weight of the whole class $=\Large\frac{2980}{80}\\ \mathrm{~kg}$ Therefore average weight = 37.25 kg

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years