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In a class of 50 students, 30% are girls. The average weight of the whole class is 45 kg and the average weight of the girls is 31 kg. What is the average weight of the boys? |
53 kg 51 kg 55 kg 65 kg |
51 kg |
Total no. of students = 50 30% = \(\frac{3}{10}\) Ratio of no. of boys to girls = 7 : 3
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