Question
Opal had 1660 mℓ more soy milk than Hazel. After Opal gave Hazel 430 mℓ of soy milk, the ratio of Opal's soy milk to Hazel's soy milk became 7 : 3. How much soy milk did Opal have at first? Give your answer in millilitres.
4 m

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Opal had 1660 mℓ more soy milk than Hazel. After Opal gave Hazel 430 mℓ of soy milk, the ratio of Opal's soy milk to Hazel's soy milk became 7 : 3. How much soy milk did Opal have at first? Give your answer in millilitres.