Question
Tank X was filled with water with water up to a height of 20 cm while Tank Y and Tank Z were empty. Water was poured out into Tank Y and Z such that the water in all tanks were the same height in the end. How much water was poured out of Tank X?
4 m

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Tank X was filled with water with water up to a height of 20 cm while Tank Y and Tank Z were empty. Water was poured out into Tank Y and Z such that the water in all tanks were the same height in the end. How much water was poured out of Tank X?