Answer :
Let's use the variable x to represent the number we want to find.
If 18 is 40% of x, we have:
[tex]\begin{gathered} 40\text{\%}\cdot x=18 \\ \text{0}.4x=18 \\ x=\frac{18}{0.4} \\ x=45 \end{gathered}[/tex]So 18 is 40% of 45.
Let's use the variable x to represent the number we want to find.
If 18 is 40% of x, we have:
[tex]\begin{gathered} 40\text{\%}\cdot x=18 \\ \text{0}.4x=18 \\ x=\frac{18}{0.4} \\ x=45 \end{gathered}[/tex]So 18 is 40% of 45.