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In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?

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47.5

525

answer is C.

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Detailed Solution

Total marks of student = 50 x 42 = 2100

total marks of 22 girls = 22 x 35 = 770

total marks of 28 boys = 2100 - 770 = 1330

So the average of boys $= \frac{1330}{28} = 47.5$

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