Question
Cindy had 1840 mℓ more coffee than Wendy. After Cindy gave Wendy 520 mℓ of coffee, the ratio of Cindy's coffee to Wendy's coffee became 7 : 3. How much coffee did Cindy have at first? Give your answer in millilitres.
4 m

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Cindy had 1840 mℓ more coffee than Wendy. After Cindy gave Wendy 520 mℓ of coffee, the ratio of Cindy's coffee to Wendy's coffee became 7 : 3. How much coffee did Cindy have at first? Give your answer in millilitres.