Answer:
11 miles each day
Step-by-step explanation:
Marcus needs 80 miles a week. Has already ridden 25 miles.
80-25 = 55.
Marcus has 55 miles left to ride for the week and has 5 days to do it in.
Assuming he rides the same amount each day:
55 / 5 = 11 miles biked each day.
Check our work
5 days riding 11 miles a day would be 55 miles.
25 miles are already completed.
55 + 25 = 80
