Question
There was some lemon juice in a jug at first. When 800 mℓ of lemon juice was poured into it, 260 mℓ of lemon juice flowed out of the jug. If the capacity of the jug was 660 mℓ, how much lemon juice was in the jug at first?
2 m

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There was some lemon juice in a jug at first. When 800 mℓ of lemon juice was poured into it, 260 mℓ of lemon juice flowed out of the jug. If the capacity of the jug was 660 mℓ, how much lemon juice was in the jug at first?