Water(5 + 3 = 1)

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Answer: Fill up the 3 gallon container first. Pour it into the five gallon container. Fill up the 3 gallon container again, and fill up the rest of the 5 gallon container, and you should have 1 gallon left over in the 3 gallon container.

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You are right next to a river and have a 5 gallon container and a 3 gallon container. You need to measure out 1 gallon of water. How do you do it?

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