Best Answer

Several ways to achieve this - here is one solution.

Fill the 5 litre container and pour it all into the 9 litre container.

Fill the 5 litre container and pour it into the 9 litre container until the latter is full - leaving 1 litre in the 5 litre container.

Empty the 9 litre container.

Fill the 3 litre container and empty into 9 litre container. Repeat. There are now 6 litres in the 9 litre container.

Pour the 1 litre from the 5 litre container into the 9 litre container which now contains 7 litres.

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Q: Three containers have capacities of three five and nine liters How can these containers be used to measure exactly seven liters of water?
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