Quote:
Originally Posted by Pintsize725
As many times as I've that movie, I still can't remember how they did it. 
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Fill the 5 gallon jug. Fill 3 gallon jug from the 5 gallon jug leaving you two gallons in the 5 gallon jug. Empty the 3 gallon jug and pour the two gallons into it from the 5 gallon jug. Fill up the 5 gallon jug again and then pour enough to fill the 3 gallon jug. Since you already have two gallons in the 3 gallon jug, you have just poured one gallon into the 3 gallon jug leaving four gallons left in the 5 gallon jug.
TL;DR??
Math.