Question
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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