One day at the Rohan's house, Rohan and Pawan were playing a game. The rules of the game were simple. You try to make the other person flinch without touching them. You have five seconds to do this. If you do this in five seconds, you earn a point. Instead of using points, Rohan and Pawan used pieces of popcorn. After a certain amount of time, Rohan had seventeen pieces, while Pawan only had eleven. After more time, Rohan doubled his amount, while Pawan tripled his amount! After even more time, Rohan gained seven pieces, while Pawan gained only four.
How many pieces of popcorn does Rohan have to give to Pawan, so that they both have an equal amount of popcorn?