Question

There are 7 more boys than girls in a class of 25.how many girls are in the class?

Answer 1

Solution.

Let x be the number of girls in a class of 25.

Then there are x+7 boys in a class of 25.

We will have equation

x+x+7=25.

Solve this equation

$$x+x+7=25\newline 2x+7=25\newline 2x=18\newline x=9$$

Thus, there are 9 girls and 9+7=16 boys in a class of 25.

Answer. 9 girls.