Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 29 Aug 2016, 07:53

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# M06 P.S problem

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 02 Oct 2008
Posts: 58
Followers: 5

Kudos [?]: 51 [0], given: 0

M06 P.S problem [#permalink]

### Show Tags

12 Dec 2009, 11:33
The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, how many subsequent flights need to depart from Phoenix on-time, for the airport's on-time departure rate to be higher than 90%?

6
7
9
10
11
In order to reach an above 90% on-time departure rate, the airport will need to have 10 out of 11 flights depart on time, so 7 more is the answer. If only 6 more depart on-time, it will be 90% exactly, and that's not enough.

The correct answer is B.

I am not sure why number 11 was chosen to solve the problem ? why other random numbers were no considered solve the above one? Please explain
VP
Joined: 05 Mar 2008
Posts: 1473
Followers: 11

Kudos [?]: 253 [0], given: 31

Re: M06 P.S problem [#permalink]

### Show Tags

12 Dec 2009, 11:54
tania wrote:
The first flight out of Phoenix airport had a late departure. If the next three flights departed on-time, how many subsequent flights need to depart from Phoenix on-time, for the airport's on-time departure rate to be higher than 90%?

6
7
9
10
11
In order to reach an above 90% on-time departure rate, the airport will need to have 10 out of 11 flights depart on time, so 7 more is the answer. If only 6 more depart on-time, it will be 90% exactly, and that's not enough.

The correct answer is B.

I am not sure why number 11 was chosen to solve the problem ? why other random numbers were no considered solve the above one? Please explain

9/10 = 90%
but we want over 90%
10/11 > 90%
Re: M06 P.S problem   [#permalink] 12 Dec 2009, 11:54
Similar topics Replies Last post
Similar
Topics:
1 M06 P.S Q20 7 12 Dec 2009, 12:17
19 PS: Exponents (m06q07) 20 13 Nov 2008, 11:25
33 M06 #08 26 04 Nov 2008, 01:59
1 M06 #19 6 24 Sep 2008, 21:16
PS: Condominium (m06q35) 1 15 Aug 2008, 09:59
Display posts from previous: Sort by

# M06 P.S problem

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

Moderator: Bunuel

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.