Valerie bought a pair of shoes that were on sale for 20% off. The sale price was $120. What was the original price?

Let X be the original price.

Since 20% off the original price is $120, then 0.2*X = $120.
Then the original price X = $120 / 0.2 = $<<120/0.2=600>>600. Answer: \boxed{600}.