Average marks scored by the girls in a class 36 and that by the boys in same class is 42.
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Step-by-step explanation:
Let the number of boys and girls be x and y
According to the question
52x+42y=50(x+y)
52x+42y=50x+50y
52x−50x=50y−42y
2x=8y
∴ x=4y ------ ( 1 )
Total number of students in the class =x+y
=4y+y
[ From ( 1 )
=5y
Percentage of boys=4y/5y×100
=80 •/•
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