Out of 40 students of a class 12 are boys. If the average weight of a boy is 50 kg and the average weight of a girl is 20% less than a boy, find the ratio of the total weight of the boys to the total weight of the girls.

Out of 40 students of a class 12 are boys. If the average weight of a boy is 50 kg and the average weight of a girl is 20% less than a boy, find the ratio of the total weight of the boys to the total weight of the girls. Correct Answer 3 : 7

The weight of all the boys of the class = 12 * 50 = 600 kg The weight of all the girls of the class = (40 – 12) * (50 – 20% of 50) = 28* 50 = 1400 kg The ratio = 600 : 1400 = 3 : 7
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