The average weight of 25 students of section A of a class is 60 kg, whereas the average weight of 35 students of section B of the same class is 62.5 kg. Find out the average weight of all the 60 students of the class.

Correct option is D

Given: 

The average weight of 25 students of section A of a class is 60 kg,

The average weight of 35 students of section B of the same class is 62.5 kg.

​$$\text{Formula:} = \frac {\text{sum of weight}}{\text{no of person}}\\\text{Total weight of section A} = 25 \times 60 = 1500 \text{ kg} \\[10pt]\text{Total weight of section B} = 35 \times 62.5 = 2187.5 \text{ kg} \\[10pt]\text{Total weight of all 60 students} = 1500 + 2187.5 = 3687.5 \text{ kg} \\[10pt]\text{Average weight} = \frac{3687.5}{60} = 61.4583\ldots \approx 61.46 \text{ kg} \\[10pt]\text{Correct answer is }{61.46}$$​​