Question 93
In a class of 56 students there are 28 girls. The average weight of these girls is 46 kg and average weight of the full class is 51 kgs. What is the average weight of the boys of the class?
Solution
Total number of students = 56 and number of girls = 28
=> Number of boys in class = 56 - 28 = 28
Average weight of girls = 46 kg
=> Total weight of girls = $$46 \times 28 = 1288$$ kg
Similarly, total weight of full class = $$51 \times 56 = 2856$$ kg
=> Total weight of boys = 2856 - 1288 = 1568 kg
$$\therefore$$ Average weight of boys = $$\frac{1568}{28} = 56$$ kg
=> Ans - (B)
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