Question 90

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

Solution

Total number of students = 66 and number of girls = 33

=> Number of boys in class = 66 - 33 = 33

Average weight of girls = 61 kg

=> Total weight of girls = $$61 \times 33 = 2013$$ kg

Similarly, total weight of full class = $$66 \times 66 = 4356$$ kg

=> Total weight of boys = 4356 - 2013 = 2343 kg

$$\therefore$$ Average weight of boys = $$\frac{2343}{33} = 71$$ kg

=> Ans - (D)

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