Question

Find the number of boys in the class room with 45 students and number of girls is1/2 of number of boys

Answer 1

let the no. of boys in the class be x
so the no. of girls is x/2
so
x+x/2=45
=2x+x/2=45
=3x/2=45
=3x=2*45
=x=45*2/3
=x=15*2
=x=30
so the no. of boys is 30