Question
Tank B was filled with water with water up to a height of 21 cm while Tank C and Tank D were empty. Water was poured out into Tank C and D such that the water in all tanks were the same height in the end. How much water was poured out of Tank B?
4 m

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Tank B was filled with water with water up to a height of 21 cm while Tank C and Tank D were empty. Water was poured out into Tank C and D such that the water in all tanks were the same height in the end. How much water was poured out of Tank B?