You fill the 5 gallon jug until it is full using a 3 gallon jug. You have to do it twice because 3 gallons is less than 5 gallons. After the second filling, the 3 gallon jug still has 1 gallon remaining that you did not use. After this you empty the 5 gallon jug and pour the 1 gallon of water in it from the 3 gallon jug. Now your 5 gallon jug has 1 gallon of water. The last step is to add 3 more gallons to it using a 3 gallon jug, and you will have 4 gallons of water in a 5 gallon jug.
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