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प्रश्न
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?
पर्याय
73
65
68
74
MCQ
उत्तर
65
Explanation:
Total student = 100
Total marks of 70 boys = 75 × 70 = 5250
⇒ Total marks of girls = 7200 – 5250 = 1950
Number of girls = 100 – 70 = 30
Average of girls = `1950/30` = 65
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