ART CLASSES Students in a painting class must pay an art supplies fee. On the first day of class, the instructor collected a total of $28 in fees from several students. On the second day she collected $21 more from some other students, and on the third day she collected another $63 from some more students.
a. What is the most the art supplies fee could cost per student?
b. Use your answer in part a to determine how many students paid the art supplies fee each day.
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