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The average weight of 60 students is 40 kg. There are 60% boys among them. If the average weight of the boys is 48 kg, find the average weight of the girls.

1. 24 kg
2. 36 kg
3. 28 kg
4. 44 kg

Correct answer: 28 kg

Solution

Total weight of 60 students is 60 × 40 = 2400 kg. Boys are 60% of 60, so there are 36 boys with total weight 36 × 48 = 1728 kg. Girls' total weight is 2400 - 1728 = 672 kg, so their average is 672/24 = 28 kg.

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