Question

in a class of 40 pupils,the number of girls is three-fifths of nom of boys.find nom of boys in class

Answer 1

pupils= 40 
girls =3/5*40
       =24 
nu.. of boys= 40-24
                  =16
 so, 16 boys

Answer 2

Sol: Total students=40
Boys=x ...(i)
Then girls= 3/5 of x ...(ii)
Total students= Number of boys + Number of girls
=> x+3x/5=40
= 5x+3x/5=40
Or, 8x/5=40
8x=200
x=200/8 (transposing 8 to other side)
x=25
Boys=25
Girls=3/5×25
=15
Total=25+15=40
Which is correct!
Hence the solution is correct.