Question
There was some grapefruit juice in a jug at first. When 810 mℓ of grapefruit juice was poured into it, 190 mℓ of grapefruit juice flowed out of the jug. If the capacity of the jug was 670 mℓ, how much grapefruit juice was in the jug at first?
2 m

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There was some grapefruit juice in a jug at first. When 810 mℓ of grapefruit juice was poured into it, 190 mℓ of grapefruit juice flowed out of the jug. If the capacity of the jug was 670 mℓ, how much grapefruit juice was in the jug at first?