Question

Total 40 students in a class 15 are boys find out the ratio between boys and girls

Answer 1

Number of girls=40-15=25
ratio of boys:girls
=15:25
=3:5

Answer 2

Total no.of students in a class=40
No.of boys in a class=15
No.of girls in a class=Total no.of students- Total no.of boys
So, 40-15=25.
Now according to the question:
Boys: Girls
15:25
So, ratio between girls and boys is 3:5...

Hope it helps----------