Question 91

In a class of 39 students there are 36 girls. The average weight of these girls is 38 Kg and average weight of the full class is 40 kgs. What is the average weight of the boys of the class?

Solution

Total number of students = 39 and number of girls = 36

=> Number of boys in class = 39 - 36 = 3

Average weight of girls = 38 kg

=> Total weight of girls = $$38 \times 36 = 1368$$ kg

Similarly, total weight of full class = $$40 \times 39 = 1560$$ kg

=> Total weight of boys = 1560 - 1368 = 192 kg

$$\therefore$$ Average weight of boys = $$\frac{192}{3} = 64$$ kg

=> Ans - (B)

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