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The ratio of number of boys and girls in a class is 2 : 3. The average weight of boys and girls in the class is 18 kg and 21 kg respectively. What is the average weight (in kgs) of all the boys and girls together?1). 99/52). 101/53). 109/64). 96/5 |
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Answer» Let the number of BOYS in the CLASS be 2A Then, the number of girls will be 3a Given: Average weight of boys in the class = 18 kg Average weight of girls in the class = 21 kg Total weight of boys = 18 × 2a = 36A Total weight of girls = 21 × 3a = 63a Total weight of the class = 36a + 63a = 99a Hence, average weight (in KGS) of all the boys and girls together = 99a/(2a + 3a) = 99/5 |
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