i believe that sofia's sparkling orange juice (or whatever it is) is going to have the stronger orange taste because for every two liters of sparkling water she adds a liter or orange juice, whereas, sarah's is for every three liters of sparkling water she adds a liter of orange juice. sooooo sofia is most likely going to have the stronger orange flavor.
Sofia would have the stronger orange flavor with the ratio being 4 to 8 while Sarah's ratio would be 3 to 9. Sofia has the more orange flavor because she added 4 liters of it into her mixture while Sarah only added 3
If you need it to be explained further just let me know and I will put it in the comments, I try to make my answers as straightforward as possible. :)
