Question
Risa had 1700 mℓ more coffee than Marion. After Risa gave Marion 490 mℓ of coffee, the ratio of Risa's coffee to Marion's coffee became 7 : 3. How much coffee did Risa have at first? Give your answer in millilitres.
4 m

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Risa had 1700 mℓ more coffee than Marion. After Risa gave Marion 490 mℓ of coffee, the ratio of Risa's coffee to Marion's coffee became 7 : 3. How much coffee did Risa have at first? Give your answer in millilitres.