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Gallon Puzzle
You need to measure out exactly one gallon (8 pints) of water. But you only have a 7 pint jug (currently empty), a 3 pint jug (currently empty), and a
two gallon (16 pint) bucket (very nearly full of water).
None of the containers have subdivisions - you can only measure exactly by filling one up to the brim.
You may pour water down the drain, but water poured away cannot be recovered. You don't have any supply of water except the very nearly full two gallon bucket.
How can you end up with exactly one gallon of water? You may assume that you have very steady hands.
Answers in spoiler tags please.
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