To find out what number 9 is 30% of, you can set up the equation:
\[ 0.30 \times x = 9 \]
Where \( x \) is the unknown number. To solve for \( x \), divide both sides of the equation by 0.30:
\[ x = \frac{9}{0.30} \]
Calculating this gives:
\[ x = 30 \]
So, 9 is 30% of 30.