Jug Puzzle

You have three jugs; and empty four cup jug, and empty five cup jug, and a full ten cup jug.
You need to end up with three cups of water in the ten cup jug.
You can only measure accurately by filling a jug up all the way. For example, you cannot fill the four cup jug up halfway and call it two cups.
You have no more water to add, and you cannot dump any water out.
So you can only dump water between jugs.

- Matthew Lauser