Math
posted by Keturah on .
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:
33 said they drove alone.
31 rode in a carpool.
37 rode public transportation.
9 used both carpools and public transportation.
6 used both a carpool and sometimes their own cars.
6 used buses as well as their own cars.
4 used all three methods

What is the question?