Fill the 3 gal jug and the pour it in to the 5 gal jug. Re-fill the 3 gal jug and start pouring into the 5 gal jug. When the 5 gal is full you have 1 gal left in the 3 gal jug. Empty the 5 gal jug completely, then pour the 1 remain gal from the small jug to the 5 gal. Refill the 3 gal jug then pour into the 5 gal jug. You now have 4 gals in a 5 gal jug.
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