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 1/7 (105+r) = 20 represents the situation. which describes the solution, r to this equation?

a the solution is 5, which represents the number of miles she runs each day.
b the solution is 5, which represents the number of miles she runs each week.
c the solution is 35, which represents the number of miles she runs each day.
d the solution is 35, which represents the number of miles she runs each week