Question
There was some guava juice in a jug at first. When 880 mℓ of guava juice was poured into it, 300 mℓ of guava juice flowed out of the jug. If the capacity of the jug was 620 mℓ, how much guava juice was in the jug at first?
2 m

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There was some guava juice in a jug at first. When 880 mℓ of guava juice was poured into it, 300 mℓ of guava juice flowed out of the jug. If the capacity of the jug was 620 mℓ, how much guava juice was in the jug at first?