The Water Jug Puzzle

There are three water jugs, which can hold 8, 5 and 3 gallons of water respectively. The first jug is full, and the other two are empty. It is necessary to divide the water into two equal portions, that is, to put exactly four gallons into both the 8 and 5 gallon jugs. The only operation allowed is to pour some or all of the contents of one jug into another.

Can the water be divided into two equal portions? How?

Can the water be divided into portions of 4, 2 and 2 gallons? How?

I give up, show me the solution.

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Last revised on 12 October 1999.