Question

In a class of 60 students, the ratio of girls to boys is 7:5 how many girls are In the class how many boys are in the class?

Answer 1

7x + 5x = 60
12x=60
x=5 
35 girls and 25 boys 

Answer 2

There are 35 girls and 25 boys in the class.

Explanation

The ratio of girls to boys is 7 : 5

So, lets assume that the number of girls is $7x$ and the number of boys is $5x$

Given that the total number of students in the class is 60. That means...

$7x+5x=60\\ \\ 12x=60\\ \\ x= \frac{60}{12}=5$

So, the number of girls, $7x= 7(5)=35$

and the number of boys, $5x= 5(5)=25$