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Okay so fill up the seven liter jug completely and pour as much as you can into the 4 liter jug. You now have 3 liters in the 7 liter jug and 4 liters in the 4 liter jug. Pour the 4 liter out half way, now you have 2 liters in the 4 liter jug. Now pour the contents of the 4 liter jug into the 7 liter jug that has 3 liters in it. You know have a jug with 5 liters.
Assuming that you have more than one of each size jug (you need at least two of one size and one of the other), fill the 7L jug, then pour the water from the 7L jug into the 5L jug. There is now 2L left in the 7L jug. Get a different 7L jug and fill it, then pour that into another 5L jug (or empty the first 5L jug and reuse it). Once again, you will have 2L left over in the 7L jug. Pour that 2L into the other jug with 2L left over and you will have 4 Liters of water.Expressed mathematically, (7 - 5) + (7 - 5) = 4
Fill the 5 gallon jug Pour from the 5 gallon to fill the 3 gallon jug You now have 2 gallons in the 5 gallon jug Empty the 3 gallon jug Pour the 2 gallons from the 5 gallon jug into the 3 gallon jug Fill the 5 gallon jug Pour from the 5 gallon jug to fill the three gallon jug -- this will tale 1 gallon You now have 4 gallons in the 5 gallon jug
4
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