Question
Tank W is half-filled with water while Tank X is empty. Mark poured water from Tank W into Tank X without spilling until the water level in both tanks were the same. What is the volume of the water in Tank X now?
5 m

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Tank W is half-filled with water while Tank X is empty. Mark poured water from Tank W into Tank X without spilling until the water level in both tanks were the same. What is the volume of the water in Tank X now?