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?

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Total student = 100 ; for 70 stds 75 × 70 = 5250 ⇒ 7200 − 5250 = 1950 Average of girls = 30 1950 ​ = 65

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