Question
Opal had 1310 mℓ more coffee than Risa. After Opal gave Risa 430 mℓ of coffee, the ratio of Opal's coffee to Risa's coffee became 7 : 4. How much coffee did Opal have at first? Give your answer in millilitres.
4 m

Click button first when a symbol is required. X

Opal had 1310 mℓ more coffee than Risa. After Opal gave Risa 430 mℓ of coffee, the ratio of Opal's coffee to Risa's coffee became 7 : 4. How much coffee did Opal have at first? Give your answer in millilitres.