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  Dumb.com » Riddles» You are standing by a river with a 5-gallon jug and a 3-gallon jug but you need exactly 4 gallons of water. Using only the 2 jugs you have how can you measure out 4 gallons?

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Answer: fill the 5 gallon jug- pour 3 gallon into the 3 gallon jug- leaving 2 gallon in the 5 gallon jug - throw out the 3 gallons from the 3 gallon jug - pour the 2 gallon from the 5 gallon jug into the 3 gallon jug- fill up the 5 gallon jug - top up the 3 gallon jug with 1 gallon from the 5 gallon jug - leaving 4 gallons in the 5 gallon jug.