In a mall, 1/15 of the stores sell shoes. There are 180 stores in the mall. How many of the stores sell shoes?
A ratio question! Let's look first at what we're trying to find.
We have a mall and the mall has 180 stores. We want to know how many of them sell shoes. What we're told is that
We can now proceed a few different ways. One way is to cross-multiply the fractions, so we'd get:
Another way we could go would be to multiply the fraction on the left by a form of 1 to make it equal the right: