Puzzle my sister told me about, I've yet to solve it and im open to ideas.
You have 6 balls, 2 red ones, 2 blue ones, and 2 green ones. Out of each pair, 1 is heavy and 1 is light (so overall you have 3 light balls and 3 heavy balls). All the light balls weigh the same. All the heavy balls weigh the same.
You also have a standard set of scales. Your goal is to find out which ball is heavy and which ball is light out of each pair, in just 2 measurements.