The percent of what 15 is of 45 is; 33.33%
We want to find the percentage of 15 out of 45.
This means that we can express it as;
15/45 * 100%
⇒ 33.33%
Thus, we conclude that the percent of what 15 is of 45 is 33.33%
Read more about percentage at; https://brainly.com/question/843074