Math
posted by Renee Tyler .
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below
47 said they drove alone
24 rode in a carpool
35 rode public transportation
3 used both carpools and public transportation
4 used both a carpool and sometimes their own cars
6 used buses as well as their own cars
1 used all three methods
How many students are using all three (Region VII)?
___________students

You have already stated, at the end, than one student used all three modes of transportation. If you really intended to ask "How many students are using each type?", those numbers have also been provided. Is is unclear what you are asking for.