1. In a class of 56 students there are 21 girls. The average weight of these girls is 56 Kg and average weight of the full class is 62.875 kgs. What is the average weight of the boys of the class?
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By: anil on 05 May 2019 02.10 am
Total number of students = 56 and number of girls = 21 => Number of boys in class = 56 - 21 = 35 Average weight of girls = 56 kg => Total weight of girls = $$56 imes 21 = 1176$$ kg Similarly, total weight of full class = $$62.875 imes 56 = 3521$$ kg => Total weight of boys = 3521 - 1176 = 2345 kg $$ herefore$$ Average weight of boys = $$frac{2345}{35} = 67$$ kg => Ans - (C)
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