SOLUTION: Having issues with this problem. A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. How many are not using any of t

Question 610177: Having issues with this problem.
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. How many are not using any of the three?
29 said they drove alone.
35 rode in a carpool.
30 rode public transportation.
6 used both carpools and public transportation.
5 used both a carpool and sometimes their own cars.
8 used buses as well as their own cars.
3 used all three methods.
Answer by flame8855(424) (Show Source): You can put this solution on YOUR website!
the answer is 30
so in order to get this
drove alone DISABLED_event_only= 29-3-5-8 = 13
drive car and and public DISABLED_event_only= 8-3 = 5
drive car and carpool = 5-3 = 2
drive public only [ 30 -3 - 6-8= 13
drive public and carpool DISABLED_event_only= 6-3 =3
carpool only : 35-6-5-3 = 21
carpool + drive car + public = 3

so total = 13 + 5 + 2 + 13 +3 + 21 +3 = 70
so 100 -70 =30

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