|
|
| Author |
Message |
alfredxavier
Associate
Joined: 29 Dec 2006
Posts: 5
|
 Posted: Wed Jan 23, 2008 2:36 am Post subject: FRACTIONS & ARITHMETIC |
 |
|
In a poll, N people were interviewed. If 1/4 of them answered YES to question 1, and of those, 1/3 answered YES to question 2, which of the following expressions represents the number people interviewed who did not answer YES to both questions ?
a) N / 7 b) 6N / 7 c) 5N / 12 d) 7N / 12 e) 11N / 12
can anyone solve this with explanation? Thanks... |
|
| Back to top |
|
 |
ksvickram
Senior Consultant
Joined: 02 Jan 2008
Posts: 29
|
| Posted: Wed Mar 05, 2008 8:51 pm Post subject: |
|
|
If X ppl answer YES to qn 1 and Y ppl answer YES to qn 2, then
Number of ppl who answered YES to BOTH 1 and 2 is given by: (YES to 1) AND (YES to 2)
=> 1/4 * 1/3 = 1/12
Thus, number of ppl who did NOT answer YES to both the qns is given by :
=> 1 - (No of ppl answered Yes to both) = 1 - (1 / 12) = 11 / 12 Thus Choice E.
Hope this is convincing.......
 |
|
| Back to top |
|
|
|
GMAT Math eBooks | GMAT Class @ Chennai | GMAT Practice Questions
GMAT™ and GMAC™ are registered trademarks of the Graduate Management Admission Council™. The Graduate Management Admission Council™ does not endorse, nor is it affiliated in any way with the owner or any content of this web site.
Powered by phpBB © 2001, 2005 phpBB Group
|
