Question
Gwen had 2310 mℓ more coffee than Fanny. After Gwen gave Fanny 600 mℓ of coffee, the ratio of Gwen's coffee to Fanny's coffee became 7 : 4. How much coffee did Gwen have at first? Give your answer in millilitres.
4 m

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Gwen had 2310 mℓ more coffee than Fanny. After Gwen gave Fanny 600 mℓ of coffee, the ratio of Gwen's coffee to Fanny's coffee became 7 : 4. How much coffee did Gwen have at first? Give your answer in millilitres.