Water(5 + 3 = 4)

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Answer: You fill up the 3 gallon container and pour the 3 gallons into the 5 gallon container. You fill the 3 gallon container back up, and pour it into the 5 gallon container. You empty the 5 gallon container and pour the 1 gallon left in the 3 gallon container into the five gallon container. Then you fill the 3 gallon container back up and pour it into the 5 gallon container and you have 4 gallons.

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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 4 gallons of water. How do you do it?

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