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You have a 3-liter jug and a 5-liter jug.
How can you measure exactly 4 liters of water?
Answer
Fill 5L → pour into 3L (2L left). Empty 3L. Pour 2L into 3L. Refill 5L → top up 3L (uses 1L), leaving 4L in the 5L jug.
Explanation
Use pouring logic—transfer water between jugs until exactly 4L remains in the 5L jug.
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