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

29 said they drove alone.
25 rode in a carpool.
30 rode public transportation.
7 used both carpools and public transportation.
6 used both a carpool and sometimes their own cars.
8 used buses as well as their own cars.
5 used all three methods.
How many used none of the above-mentioned means of transportation?
after completing venn diagram i have the answer of 47 students..is that right?

is 47 students the correct answer?