Question
Xuan had 1780 mℓ more soy milk than Zara. After Xuan gave Zara 490 mℓ of soy milk, the ratio of Xuan's soy milk to Zara's soy milk became 7 : 3. How much soy milk did Xuan have at first? Give your answer in millilitres.
4 m

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Xuan had 1780 mℓ more soy milk than Zara. After Xuan gave Zara 490 mℓ of soy milk, the ratio of Xuan's soy milk to Zara's soy milk became 7 : 3. How much soy milk did Xuan have at first? Give your answer in millilitres.