Mathematics

Mueller

25 February, 13:45

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:

34 said they drove alone.

25 rode in a carpool.

28 rode public transportation.

4 used both carpools and public transportation.

7 used both a carpool and sometimes their own cars.

4 used buses as well as their own cars.

3 used all three methods.

How many used none of the above-mentioned means of transportation?