15 is 30 percent of what number?

To find the number of which 15 is 30 percent, you can use the following formula:

\[ \text{Number} = \frac{\text{Part}}{\text{Percent}} \times 100 \]

Here, the ‘Part’ is 15, and the ‘Percent’ is 30. Plugging these values into the formula:

\[ \text{Number} = \frac{15}{30} \times 100 \]

\[ \text{Number} = 0.5 \times 100 \]

\[ \text{Number} = 50 \]

So, 15 is 30 percent of 50.