There are two sections A and B of a class, consisting of 22 and 44 students, respectively. If the average weight of section A is 40 kg and that of section B is 34 kg, find the average weight of the whole class (in kg).​

Correct option is B

Given:

Number of students in section A = 22

Number of students in section B = 44

Average weight of section A = 40 kg

Average weight of section B = 34 kg

Formula Used:

Average weight of the whole class = $$\frac{\text{Total weight }}{\text{Total number of students }}$$​​

Solution: 

Average weight = $$\frac{22\times 40 +44 \times 34}{22+44}$$ 

$$=\frac{880 +1496}{66} \\ \ \\ =\frac{2376}{66} =36 \ kg$$​​