Question 82

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?

Solution

Sum of scores of all students=50*42=2100
Sum of 22 girls scores=35*22=770
Sum of scores of boys=2100-770
=1330
Average of boys=1330/28
=47.5

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