Question
Erika had 1720 mℓ more tea than Jaslyn. After Erika gave Jaslyn 400 mℓ of tea, the ratio of Erika's tea to Jaslyn's tea became 7 : 3. How much tea did Erika have at first? Give your answer in millilitres.
4 m

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Erika had 1720 mℓ more tea than Jaslyn. After Erika gave Jaslyn 400 mℓ of tea, the ratio of Erika's tea to Jaslyn's tea became 7 : 3. How much tea did Erika have at first? Give your answer in millilitres.