Question
Tank S was filled with water with water up to a height of 18 cm while Tank T and Tank U were empty. Water was poured out into Tank T and U such that the water in all tanks were the same height in the end. How much water was poured out of Tank S?
4 m

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Tank S was filled with water with water up to a height of 18 cm while Tank T and Tank U were empty. Water was poured out into Tank T and U such that the water in all tanks were the same height in the end. How much water was poured out of Tank S?