- Fill the 5L jug, pour into 3L jug (2L left). Empty 3L jug. Pour the 2L from 5L jug into 3L jug. Fill 5L jug and pour into 3L jug until it's full (1L goes in). 4L is left in the 5L jug.
- It is impossible.
- Fill the 3L jug and pour it into the 5L jug twice.
- Fill the 5L jug and pour 1L out.
Question: You have a 3-liter jug and a 5-liter jug. How can you measure out exactly 4 liters of water?
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