Question
Glen mixed 7 ℓ of concentrated juice with 10 ℓ of water to make persimmon juice to be served for the meeting. After the meeting, 7 ℓ of persimmon juice were left. How much persimmon juice was drunk at the meeting?
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Glen mixed 7 ℓ of concentrated juice with 10 ℓ of water to make persimmon juice to be served for the meeting. After the meeting, 7 ℓ of persimmon juice were left. How much persimmon juice was drunk at the meeting?