Question
Betty had 2200 mℓ more soy milk than Ivory. After Betty gave Ivory 420 mℓ of soy milk, the ratio of Betty's soy milk to Ivory's soy milk became 7 : 3. How much soy milk did Betty have at first? Give your answer in millilitres.
4 m

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Betty had 2200 mℓ more soy milk than Ivory. After Betty gave Ivory 420 mℓ of soy milk, the ratio of Betty's soy milk to Ivory's soy milk became 7 : 3. How much soy milk did Betty have at first? Give your answer in millilitres.