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Posted by **Ms Jackie** on Wednesday, December 5, 2012 at 9:56pm.

35 said they drove alone.

35 rode in a carpool.

30 rode public transportation.

3 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.

1 used all three methods.

______students

- math -
**Jennifer**, Friday, December 7, 2012 at 4:36pmThe total number of answers recorded is

35+35+30 = 100

3 of these answers belong to 1 person:

At this point in the problem,

person count = 1

answer count = 100-3 - 97

6 used buses as well as their own cars. One of these persons would be the person who used all three; so 5 used ONLY buses and cars

person count = 1 + 5 = 6

answer count = 97 - 5*2 = 97 - 10 = 87

6 used both a carpool and sometimes their own cars. One of these persons would have been the person who used all three methods; so 5 used ONLY a carpool and sometimes their own cars.

person count = 6 + 5 = 11

answer count = 87 - 5*2 = 87-10 = 77

3 used both carpools and public transportation; Of these, 1 of these also uses their own car; 2 use ONLY carpools and public transportation

person count = 11 + 2 = 13

answer count = 77 - 2*2 = 77-4 = 73

73 students only use one means of transportation

2+5+5 = 12 students use ONLY 2 means of transportation

1 student uses all three

73+12+1 = 86 students use some of the forms of transportation listed. A total of 100 students answered the questionnaire

100-86 = 14

14 students are not using any of these three

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