Question

please solve this question

Answer 1

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