Question
Natalie had 1680 mℓ more orange juice than Diana. After Natalie gave Diana 400 mℓ of orange juice, the ratio of Natalie's orange juice to Diana's orange juice became 7 : 3. How much orange juice did Natalie have at first? Give your answer in millilitres.
4 m

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Natalie had 1680 mℓ more orange juice than Diana. After Natalie gave Diana 400 mℓ of orange juice, the ratio of Natalie's orange juice to Diana's orange juice became 7 : 3. How much orange juice did Natalie have at first? Give your answer in millilitres.