### There are two sections A and B of a class, consisting of 36 and 44 students respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class.

A. 30 kg.

B. 35 kg.

C. 42.5 kg.

D. 37.25 kg.

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