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2015-06-20T21:06:17+05:30

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Let total students be x and boys be y
5x/8=x-120
5x=8x-960
3x=960
x=320
Total students=320=y+y+120
y=200/2=100
No. of boys=100


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2015-06-20T21:09:13+05:30

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Let the no of girls be x and boys be y then x. So x=5/8(x+y). Next steps are in pictures below
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