You are given a 3-gallon jug and a 5-gallon jug. How do you use them to get 4 gallons of liquid?

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fill 5, pour into 3. dump out from three. pour the two gallons from the five into the three. fill five gallon, pour one gallon into three (you know it's one because the three already has two so just fill to top) the five gallon jug now has four gallons

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