Question
Dana had 1940 mℓ more juice than Zara. After Dana gave Zara 450 mℓ of juice, the ratio of Dana's juice to Zara's juice became 7 : 3. How much juice did Dana have at first? Give your answer in millilitres.
4 m

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Dana had 1940 mℓ more juice than Zara. After Dana gave Zara 450 mℓ of juice, the ratio of Dana's juice to Zara's juice became 7 : 3. How much juice did Dana have at first? Give your answer in millilitres.