Question 31
In a class of 50 students there are 27 boys. The average weight of these boys is 72 Kg and average weight of the full class is 55.44 kgs. What is the average weight (in kgs) of the girls of the class?
Solution
Total number of students = 50 and number of boys = 27
=> Number of girls in class = 50 - 27 = 23
Average weight of boys = 72 kg
=> Total weight of boys = $$72 \times 27 = 1944$$ kg
Similarly, total weight of full class = $$55.44 \times 50 = 2772$$ kg
=> Total weight of girls = 2772 - 1944 = 828 kg
$$\therefore$$ Average weight of girls = $$\frac{828}{23} = 36$$ kg
=> Ans - (D)
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