7. Draw a tape diagram to represent each situation. For some of the situations, you need to decide what to represent with a variable.

a. An art class charges each student $3 to attend plus a fee for supplies. Today, $20 was
collected for the 5 students attending the class.

b. Elena ran 20 miles this week, which was three times as far as Clare ran this week
Clare ran 5 more miles this week than she did last week.