Question

Two-thirds of the children in the fourth - grade class are girls. If there are 18 girls, what is the total number of children in the class?

Answer 1

For this case, the first thing to do is define a variable.

We have then:

• x: total number of children

Then we write the equation that models the problem:

`\frac {2} {3} x = 18`

From here, we clear the value of x.

We have then:

`x = \frac {3} {2} (18)\\x = 3 * 9\\x = 27`

Answer:

the total number of children in the class is:

`x = 27`