You have a 5 gallon jug and a 3 gallon jug. You have no other measuring devices.

Measure out exactly 4 gallons of water (Assume you have a river handy, or some other limitless water supply).

First you fill the 5 gallon jug full. Empty this into the 3 gallon jug. This leaves 2 gallons in the 5 gallon jug. Next dump the water from the 3 gallon jug completely. Then pour the 2 gallons in the 5 gallon jug into the 3 gallon jug. Refill the 5 gallon jug and pour 1 gallon into the 3 gallon jug (which has 2 gallons already). Now you have 4 gallons in the 5 gallon jug.

Posted by Kenneth on 2002-11-05 10:12:43