TANCET - XAT Math Question : Averages, Arithmetic Mean

The question given below is a sample practice problem in Averages. It is an Arithmetic Topic and the problem provides an understanding of the concept of averages of two parts that constitute a whole.

Question

Average weight of 25 boys in a class is 48 kgs. The average weight of the class of 40 students is 45 kgs. What is the average weight of the 15 girls in the class?

1. 44 kgs
2. 42 kgs
3. 40 kgs
4. 39 kgs
5. 42.5 kgs

Correct Answer - 40 kgs. Choice (3)

Explanatory Answer

Total weight of boys in the class = 25 *48 = 1200 kgs

Total weight of all students in the class = 45 * 40 = 1800 kgs

Total weight of the girls in the class = 1800 - 1200 = 600 kgs

Average weight of girls = = 40 kgs
Correct answer choice (3)

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