Question
Anna had 1880 mℓ more soy milk than Gem. After Anna gave Gem 420 mℓ of soy milk, the ratio of Anna's soy milk to Gem's soy milk became 7 : 3. How much soy milk did Anna have at first? Give your answer in millilitres.
4 m

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Anna had 1880 mℓ more soy milk than Gem. After Anna gave Gem 420 mℓ of soy milk, the ratio of Anna's soy milk to Gem's soy milk became 7 : 3. How much soy milk did Anna have at first? Give your answer in millilitres.