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In a class of 100 students there are 70 ...

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?

A

73

B

65

C

68

D

74

Text Solution

Verified by Experts

The correct Answer is:
B
Total students =100
Total marks of 70 students is `75xx70=5250`.
Total marks of girls is 7200-5250=1950
So average of girls is
`(1950)/(30)=65`
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