Question

2/5 of a school are boys, what fraction of the school consists of girls? If there are 240 girls, what is the number of boys?

Answer 1

Fraction of girls + fraction of boys =1

Fraction of girls =1 - 2/5

Fraction of girls = 3/5



Now,
Let the number of girls be 3x/5

3x/5 = 240

x/5 = 80

x =400


Total number of students =400


Number of boys = 400-240

Number of boys =160




I hope this will help you


-by ABHAY