Problem: Jason had 20 lollipops. He gave Denny some lollipops. Now Jason has 12 lollipops. How many lollipops did Jason give to Denny?
Solution: Jason started with 20 lollipops, but now he only has 12, so he gave Denny 20 - 12 = 8 lollipops.
Equation: 20 - 12 = 8.
Answer: 8