Question
Olivia had 1640 mℓ more juice than Zara. After Olivia gave Zara 460 mℓ of juice, the ratio of Olivia's juice to Zara's juice became 7 : 3. How much juice did Olivia have at first? Give your answer in millilitres.
4 m

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Olivia had 1640 mℓ more juice than Zara. After Olivia gave Zara 460 mℓ of juice, the ratio of Olivia's juice to Zara's juice became 7 : 3. How much juice did Olivia have at first? Give your answer in millilitres.