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Number Puzzle #27- Unfair Advantage -

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Puzzle Image
Ethan and Theo are getting ready for a friendly water balloon fight when Theo protests "Wait, it's not fair, you have three times as many balloons as I do!" Ethan, being a good sport, gives Theo ten of his balloons. "It's still not fair" Theo says, "you still have twice as many balloons as I do!"

How many more balloons must Ethan give Theo so that each of them have the same number?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?