Question 109

The average weights of students in two sections of a class are 40 kg and 42 kg respectively. If the number of students in the two sections are in the ratio 3 : 4, find the average weight of the class.

Solution

Let the number of students in the two sections be 3k and 4k.
Total weight of the class = 3k * 40 + 4k * 42 = 120k + 168k = 288k
So, average weight of the class = 288k/(3k + 4k) = 288/7 = 41.14 kg

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