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let the number of students in school be X
the the number of girls will be 40/100 of X and number of boys will be x-40/100×x
now number of boys is 600 so
600=x-40/100×x
600=60x/100
X=600×100/60
X=1000
so total number of students is 1000
now number of girls =40/100×1000
=400
the the number of girls will be 40/100 of X and number of boys will be x-40/100×x
now number of boys is 600 so
600=x-40/100×x
600=60x/100
X=600×100/60
X=1000
so total number of students is 1000
now number of girls =40/100×1000
=400
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