Gisele trains 7 days per week for a biathlon. She covers a total of 20 miles cycling and running each day. Gisele cycles a total of 105 miles each week, and runs a certain number of miles per week. If she cycles the same number of miles each day and runs the same number of miles each day, the equation StartFraction 1 over 7 EndFraction (105 + r) = 20 represents the situation. Which describes the solution, r, to this equation? The solution is 5, which represents the number of miles she runs each week.

The solution is 35, which represents the number of miles she runs each day.

The solution is 5, which represents the number of miles she runs each day.

The solution is 35, which represents the number of miles she runs each week.