Question

15 is 25% of the what number?

Answer 1

1. Represent percentages as the number divided by 100. So 25% becomes 0.25. 
2. Change the word "is" to "=" 
3. Change the word "of" to a multiplication sign. 

So "15 is 25% of what number" 

becomes 

15 = 0.25x (Where x is the number you are trying to solve for). 

In this simple algebra equation, x = 15/.25 = 60.

Answer 2

Well, because 25% is one quarter, 1/4, you would multiply 15 by 4, as you would multiply 25% by 4 to find 100%. That means your answer is 60.