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You have a 5-liter and a 3-liter jug; measure exactly 4 liters.
How?
Answer
Fill 5→ pour to 3 (2 left). Empty 3. Pour 2 to 3. Refill 5, top up 3 (1 used), 4 remains in 5
Explanation
Standard jug solution yields 4 L left in 5-L jug.
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