Question
There was some mango juice in a jug at first. When 830 mℓ of mango juice was poured into it, 250 mℓ of mango juice flowed out of the jug. If the capacity of the jug was 630 mℓ, how much mango juice was in the jug at first?
2 m

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There was some mango juice in a jug at first. When 830 mℓ of mango juice was poured into it, 250 mℓ of mango juice flowed out of the jug. If the capacity of the jug was 630 mℓ, how much mango juice was in the jug at first?