Robert and David were preparing to have a water balloon fight. “No Fair” cried Robert, “You have 3 times as many as I do!” David said “Fine!” and gave Robert 10 more balloons. “Still not fair!” argued Robert, “You still have twice as many as I do.” How many more balloons must David give Robert for them to have the same number?
Answer: David must give Robert another 20 water balloons, giving them each 60. Robert started with 30 water balloons and David with 90.
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