Gallons of Water

You have a jug that holds five gallons, and a jug that holds three gallons. Without using any other containers and assuming that there are no markings on the jugs, obtain exactly seven gallons of water from a faucet. How about four gallons?

Answer
7 Gallons

  1. Fill the 5 gallon jug and then empty it into the 3 gallon jug.
  2. Empty the 3 gallon jug out and then replace it with the remaining two gallons from the 5 gallon jug
  3. Refill the 5 gallon jug. Both jugs now contains a total of seven gallons

4 Gallons

  1. Fill the 3 gallon jug and then empty it into the 5 gallon jug.
  2. Repeat the procedure above. There should be one gallon left in the 3 gallon jug that will not fit.
  3. Empty the 5 gallon jug out and pour the remaining one gallon from the 3 gallon jug
  4. Refill the 3 gallon jug. Both jugs now contains a total of four gallons

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