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You could fill the 7-liter bucket and pour water into the aquarium until it is full, but that would make too much sense. If you really need to have three liters, fill the 7-liter bucket (which, although unmarked, will be larger than the 4-liter bucket) and pour it into the 4-liter bucket. When the 4-liter bucket is full, there will be three liters remaining in the 7-liter bucket.

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Q: If you have a 4 -liter bucket and a 7-liter bucket. You need 3-liters of water for an aquarium.Explain how to get 3 liters of water if neither bucket is marked.?
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