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In a class of 50 students, there are 30 girls who scored an average of 88 marks. If the class average is 78, what are the average marks of boys?
Question

In a class of 50 students, there are 30 girls who scored an average of 88 marks. If the class average is 78, what are the average marks of boys?

A.

72

B.

63

C.

80

D.

83

Correct option is B

Sum of marks of whole class = 78× 50 = 3900

Sum of marks of girls = 30× 88 = 2640

let the average marks of boys be x

Sum of boys marks = 20x

3900= 2640+ 20x

x= 63

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