Question

if 39 is 15% of a number what is the number

Answer 1

https://decimal.info/what-number/39-is/15-percent-of-what-number.html#:~:text=If%20we%20substitue%20%22what%20number,is%2015%20percent%20of%20260.

Answer 2

Well what we'd do here is divide it by its decimal equivalent to get what it was taken from:
39/0.15 = 260