You have a 5-liter jug and a 3-liter jug, but no measurement markings. How do you measure exactly 4 liters of water?

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Fill the 5L jug. Pour into 3L jug (leaving 2L in 5L jug). Empty 3L jug. Pour the 2L from 5L into 3L jug. Fill 5L jug again. Pour from 5L into 3L until full (adds 1L), leaving exactly 4L in the 5L jug.

Water Jug Challenge

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