In a class, 60% of the students are girls. There are 18 girls in the class. How many boys are in the class? How many students are in the class?

60% are girls, there are 18 girls in the class. How many boys?

This is quite easy to understand.

6x/10 = 18

6x/10 * 10 = 18*10

6x = 180

x = 30

Now, thats the total, subtract by the girls.

30-18 = 12

Answer: 12

Percentage of students that are girls in the class = 60%

Number of girls in the class = 18

Let us assume the total number of students in the class = x

Then

60% * x = 18

(60/100) * x = 18

6x/10 = 18

6x = 18 * 10

6x = 180

x = 180/6

= 30

So the total number of students in the class is 30.

Number of boys in the class = 30 - 18

= 12

So there are 12 boys in the class. I hope the procedure is simple enough for you to understand.