Water Balloon fight riddle
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Jacob and John were preparing to have a water balloon fight. “No Fair” cried Jacob, “You have 3 times as many as I do!” John said “Fine!” and gave Jacob 10 more balloons. “Still not fair!” argued Jacob, “You still have twice as many as I do.” How many more balloons must John give Jacob for them to have the same number?
20
They started with x and 3x balloons.
After giving 10 balloons they have x+10 and 3x-10 balloons and 2(x+10) = 3x-10.
This gives x=30
They started with 30 and 90 balloons.
After giving 10 balloons they have 40 and 80 balloons.
When John give Jacob another 20 balloons they both have 60 balloons
John must give Jacob 20 more balloons.
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