Question
Esther had 1700 mℓ more orange juice than Risa. After Esther gave Risa 490 mℓ of orange juice, the ratio of Esther's orange juice to Risa's orange juice became 7 : 3. How much orange juice did Esther have at first? Give your answer in millilitres.
4 m

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Esther had 1700 mℓ more orange juice than Risa. After Esther gave Risa 490 mℓ of orange juice, the ratio of Esther's orange juice to Risa's orange juice became 7 : 3. How much orange juice did Esther have at first? Give your answer in millilitres.