Okay so...

Fill the 5 gallon jug with water and then pour that water into the the 3 gallon jug to fill to the top, leaving 2 gallons in the 5 gallon jug. Then you dump out the 3 gallon jug. Then you pour the remaining 2 gallons from the 5 gallon jug into the 3 gallon jug.
Then you fill the 5 gallon jug to the top. Then you pour water from your full 5 gallon jug until you fill the 3 gallon jug leaving you with FOUR GALLONS in the 5 gallon jug.

You’re welcome.
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