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Jugs
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Given a 3-litre jug, a 5-litre jug, and an unlimited supply of water, can you get exactly 4 litres into the 5-litre jug ? They are not calibrated.
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For more on marking an answer as the "Best Answer", please visit our FAQ.Fill the 5 litre jug.
Fill the 3 litre with this.
Leaves 2 litres in the 5 litre jug.
Empty the 3 litre jug away( what a waste).
Pour the remainder of the 5 litre jug into the 3 litre jug.
Fill up the 5 litre jug and pour enough to fill the 3 litre jug.
This should take 1 litre, leaving 4 litres in the 5 litre jug.
Phew!