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⟩ How to measure 4 liters of water using a 3 liter and a 5 liter jug?

1. Make sure both jugs are empty.

2. Fill the 3 liter jug to the top.

3. Pour the contents of the 3 liter jug into the 5 liter jug.

4. Fill the 3 liter jug to the top.

5. Pour the contents of the 3 liter jug into the 5 liter jug until the 5 liter jug is full (i.e. contains exactly 5 liters of water.)

6. There should now be exactly 1 liter remaining in the 3 liter jug.

7. Empty the contents of the 5 liter jug and then pour the contents of the 1 liter jug into the 5 liter jug.

8. Now fill the 3 liter jug to the top. You now have 4 liters of water (1 liter in the 5 liter jug and 3 liters in the 3 liter jug).

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