For this case we have to:
x: Be the variable that represents the unknown
Then according to the statement we have:
![\frac {3} {4} * x = 18](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ntdwxiwgwfizgh17bydvy6269c1rnnxree.png)
To find the number we clear "x":
We multiply by 4 on both sides of the equation:
![3x = 18 * 4\\3x = 72](https://img.qammunity.org/2020/formulas/mathematics/middle-school/uykgbvb9fyzoqjy32khuv1cfnwnxx26fuw.png)
We divide by 3 on both sides of the equation:
![x = \frac {72} {3}\\x = 24](https://img.qammunity.org/2020/formulas/mathematics/middle-school/bn4alnlw03yk66h2oo4pesjavjng5wpdyz.png)
So, the number is 24.
Answer:
24