Question
Natalie had 1540 mℓ more milk than Cathy. After Natalie gave Cathy 420 mℓ of milk, the ratio of Natalie's milk to Cathy's milk became 5 : 3. How much milk did Natalie have at first? Give your answer in millilitres.
4 m

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Natalie had 1540 mℓ more milk than Cathy. After Natalie gave Cathy 420 mℓ of milk, the ratio of Natalie's milk to Cathy's milk became 5 : 3. How much milk did Natalie have at first? Give your answer in millilitres.