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.

Explanation:-

The otal weight of (36+44) Students of A and B,
= (36*40 +44*35)kg = 2980kg.
Therefore average weight of the whole class,
= (2980/80) kg.
Therefore average weight = 37.25kg.