Sunday

September 21, 2014

September 21, 2014

Posted by **lyn** on Sunday, January 27, 2013 at 2:56pm.

23 said they drove alone.

30 rode in a carpool.

31 rode public transportation.

4 used both carpools and public transportation.

3 used both a carpool and sometimes their own cars.

3 used buses as well as their own cars.

1 used all three methods.

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

- Algebra with applications -
**Reiny**, Sunday, January 27, 2013 at 4:05pmdrove alone --- A

carpool ------- B

public trans ----C

number(A or B or C) = number A + number B + number C - Number (AandB) - number (Aand C) - number (Band C) + number (AndBandC)

= 23 +30 +31 - 4 - 3 - 3 + 1

= 75

so 100 - 75 or**25**used none of the above

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