Question

One-fifth of a number is$9$. Find the number

Answer 1

Let the unknown number be $"\text{x}"$

According to the question,

$$\begin{gathered} \frac{1}{5}\text{of x}=9 \\ \Rightarrow \frac{1}{5}\times \text{x = 9} \\ \Rightarrow 5\times \frac{1}{5}\times \text{x}=9\times 5 \\ \Rightarrow \text{x = 45} \end{gathered}$$

Hence, the unknown number is$45.$