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How do you know when they've got exactly 4 gallons?
There are two ways to do it with only the 2 jugs provided
Fill the 5 gal, empty the 5 into the 3 gal. Now you have 2 gal in the 5. Empty the 3 gal. Then pour the 2 gal into empty 3 gal. Next fill up the 5 gal again, then pour into the 3 gal, leaving exactly 4 gal in the 5 gal jug
How do you know when they've got exactly 4 gallons?
There are two ways to do it with only the 2 jugs provided
Fill the 5 gal, empty the 5 into the 3 gal. Now you have 2 gal in the 5. Empty the 3 gal. Then pour the 2 gal into empty 3 gal. Next fill up the 5 gal again, then pour into the 3 gal, leaving exactly 4 gal in the 5 gal jug