Question
There was some persimmon juice in a jug at first. When 800 mℓ of persimmon juice was poured into it, 300 mℓ of persimmon juice flowed out of the jug. If the capacity of the jug was 620 mℓ, how much persimmon juice was in the jug at first?
2 m

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There was some persimmon juice in a jug at first. When 800 mℓ of persimmon juice was poured into it, 300 mℓ of persimmon juice flowed out of the jug. If the capacity of the jug was 620 mℓ, how much persimmon juice was in the jug at first?