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

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