The problem states: "9 is 20% of what number?". This can be written as an equation where we are solving for the unknown number.

1. Problem Description

The problem states: "9 is 20% of what number?". This can be written as an equation where we are solving for the unknown number.

2. Solution Steps

Let $x$ be the unknown number. The problem states that 9 is 20% of $x$. We can write this as:

$9 = 0.20 \times x$

To solve for $x$, we can divide both sides of the equation by 0.20:

$x = \frac{9}{0.20}$

$x = \frac{9}{\frac{20}{100}}$

$x = \frac{9}{\frac{1}{5}}$

$x = 9 \times 5$

$x = 45$

3. Final Answer

The final answer is 45.