Question

The ratio of boys to girls in a class is 7:4 the class has 15 more boys than girls how many girls are there in the class

Answer 1

Answer:

no. of girls =20, boys=35

Step-by-step explanation:

let the no.of boys =x, girls =y

x/y=7/4

4x=7y (eq.1)

x=y+15 (eq.2)

substitute eq.2 in eq.1,

4*(y+15)=7*y

4y+60=7y

60=7y-4y

60=3y

y=20

substitute y=20 in eq.2,

x=y+15

x=20+15

x=35

therefore no.of girls=20, boys = 35