Question

in class of 40 pupils the number of girls is three-fifth of the number of boys. find the number of boys in the class? 

Answer 1

Thank you for asking the question!
There is a class with 40 pupils, three fifth are the girls. so the number of boys will be calculated as follows.
Suppose Total pupils= 40
               Number of girls= 3\5       
               Number of boys= ?
According to a equation:
                y + 3 y\5 = 40
                        8 y\5 = 40
                               = 40*5\8
                               = 25
Hence the total number of boys are 25.
Hope it helps.

Answer 2

=y+3y/5=40

=8y/5=40

=40×5/8

=25