Mathematical problem: dividing water

1. Fill a 5L cup, and then pour 5L water into a 7L cup.

Fill the 5L cup again, so that there is 2L water in the bottle.

3. Add the water in the 5L cup to the 7L cup, so there is 3L water in the 5L cup.

4. Pour the water in the 7L cup into the bottle, and pour the water in the 5L cup into the 7L cup. Now there is 9L water in the bottle and 3L water in the 7L cup.

5. Fill a 5L cup, then pour 5L water into a 7L cup, so now there is 1L water in the 5L cup.

6. Pour the water in the 7L cup into the bottle, and pour the water in the 5L cup into the 7L cup. Now there is 1 1L water in the bottle and 1L water in the 7L cup.

7. Fill a 5L cup, then pour 5L water into a 7L cup. Now there is 6L of water in the 7L cup.

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