Question
Gwen had 1880 mℓ more orange juice than Eva. After Gwen gave Eva 420 mℓ of orange juice, the ratio of Gwen's orange juice to Eva's orange juice became 7 : 3. How much orange juice did Gwen have at first? Give your answer in millilitres.
4 m

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Gwen had 1880 mℓ more orange juice than Eva. After Gwen gave Eva 420 mℓ of orange juice, the ratio of Gwen's orange juice to Eva's orange juice became 7 : 3. How much orange juice did Gwen have at first? Give your answer in millilitres.