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

hello frnd!

total number of students in the class=40

let the no. of boys be x.

therefore no. of girls will be 3x/5

→3x/5+x=40

→(3x+5x)/5=40

→8x/5=40

→8x=40×5

→8x=200

→x=200/8

→x=25

hence total no. of boys is x=25

hope this helps...

Answer 2

$\frac{3}{5} x + x = 40 \\ \frac{8x}{5} = 40 \\ x = \frac{40 \times 5}{8 } \\ x = 25 \\ number \: of \: boys = 25$