Question
Anna had 1980 mℓ more milk than Nora. After Anna gave Nora 510 mℓ of milk, the ratio of Anna's milk to Nora's milk became 7 : 3. How much milk did Anna have at first? Give your answer in millilitres.
4 m

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Anna had 1980 mℓ more milk than Nora. After Anna gave Nora 510 mℓ of milk, the ratio of Anna's milk to Nora's milk became 7 : 3. How much milk did Anna have at first? Give your answer in millilitres.