Puzzle: You have a 3-liter and a 5-liter water container, and neither one is marked aside from the total volume. A tap is also now flowing. In order to measure out exactly 4 liters of water, we must utilize the containers and the tap in the right way. How is this possible?
Pouring Water
Solution:
Measuring out exactly 4 liters of water using a 3-liter and a 5-liter container and a tap involves the following steps:
Pouring Water
- Fill the 3-liter container from the tap.
- Pour the 3 liters of water from the 3-liter container into the 5-liter container.
- Fill the 3-liter container again.
- Again pour the water from the 3-liter container into the 5-liter container until full. This will ensure that there is exactly 1 liter of water left in the 3-liter container.
- Discard the water from the 5-liter container.
- Pour 1 liter of water from the 3-liter container into the 5-liter container.
- Fill the 3-liter container completely using the tap again.
- Pour the water from the 3-liter container into the 5-liter container until the former is empty.
The above procedure will ensure exactly 4 liters of water in the 5-liter container.
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