January 22, 2019 January 22, 2019 10:00 PM PST 11:00 PM PST In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one. January 26, 2019 January 26, 2019 07:00 AM PST 09:00 AM PST Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.
Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 52385

Question Stats:
57% (01:06) correct 43% (01:02) wrong based on 188 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 52385

Re M0603
[#permalink]
Show Tags
15 Sep 2014, 23:26



Intern
Joined: 27 Aug 2014
Posts: 2

Re M0603
[#permalink]
Show Tags
11 Feb 2015, 13:36
I think this question is poor and not helpful. it is not clear "subsequent" to which number: the 1 flight late, or the 3 flight on time. can be formulated "how many more subsequent flights..."



Intern
Joined: 09 Feb 2015
Posts: 20

Re: M0603
[#permalink]
Show Tags
02 May 2015, 06:34
Let x be subsequent flights need to depart from Phoenix ontime. To the airport's ontime departure rate to be higher than 90%: 3+x/4+x >0.9 => 0.1x>0.6 => x>6, x=7. Is it right.



Intern
Joined: 17 Mar 2014
Posts: 5

Re M0603
[#permalink]
Show Tags
16 Sep 2015, 02:18
I think this is a poorquality question and I don't agree with the explanation.



Math Expert
Joined: 02 Sep 2009
Posts: 52385

Re: M0603
[#permalink]
Show Tags
16 Sep 2015, 02:42



Intern
Joined: 18 Aug 2015
Posts: 6

Re: M0603
[#permalink]
Show Tags
15 Oct 2015, 10:24
This is a very straightforward question. For the % to be > 90, we need atleast 10 flights on time (as 1 was delayed). 3 of those 10 were ontime, hence 7 more are required.



Intern
Joined: 14 Jun 2014
Posts: 7

Re M0603
[#permalink]
Show Tags
04 Apr 2016, 05:06
I think this is a poorquality question and I agree with explanation. somehow agree . I think "minimum" should be added be fore ontime because otherwise 9,10,11 subsequent flights also make a ontime departure rate higher then 90%



Math Expert
Joined: 02 Aug 2009
Posts: 7211

Re: M0603
[#permalink]
Show Tags
04 Apr 2016, 05:19
deospaima wrote: I think this is a poorquality question and I agree with explanation. somehow agree . I think "minimum" should be added be fore ontime because otherwise 9,10,11 subsequent flights also make a ontime departure rate higher then 90% Hi, 1) firstly I really don't understand why it is a Poor Q. It is a very normal Q. 2) Yes, minimum would have made things more clearer. BUT when we say how many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%?, I think it conveys the same meaning..
_________________
1) Absolute modulus : http://gmatclub.com/forum/absolutemodulusabetterunderstanding210849.html#p1622372 2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html 3) effects of arithmetic operations : https://gmatclub.com/forum/effectsofarithmeticoperationsonfractions269413.html
GMAT online Tutor



Intern
Joined: 14 Jun 2014
Posts: 7

Re: M0603
[#permalink]
Show Tags
04 Apr 2016, 08:32
when you send feedback from CATs in Gmat Club if you tick "poor questions" it automatically ads this to the thread..so actually I don't find it a poor questions , I just think it should be more clear. honestly I don't agree with this : BUT when we sayhow many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%?, I think it conveys the same meaning.. in GMAT questions I think you shouldn't have 2 answers that verify the conditions..and here we have multiple ones..just my opinion



Intern
Joined: 23 Apr 2016
Posts: 7

Re: M0603
[#permalink]
Show Tags
10 Jun 2016, 08:53
Bunuel wrote: prodigypringle wrote: I think this is a poorquality question and I don't agree with the explanation. Please elaborate WHY do you think that the question is of poorquality. Thank you. Bunuel, I believe this is a good question however it seems to me that "subsequent" is used in a vague manner. Subsequent from the first flight (104=6 additional ontime flights needed to bring % to 90) or subsequent from the FIRST ontime flight (103=7 additional flights needed to bring percentage to 90)? I chose 6 as my answer because I was counting all subsequent flights from the first late departure. Aside from this I do think it is a good question



Intern
Joined: 04 Jan 2015
Posts: 7

Re: M0603
[#permalink]
Show Tags
25 Aug 2016, 13:10
I think this question tests your verbal skills also , and i got it wrong too . But for those who believe that the language is inappropriate , its not. If the next three flights departed ontime, how many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%? The underlined portion is clearly making a play on the "next three flights" , and the significance of the word "need" is to mean that we "need" to find the minimum number of more subsequent flights. I hope everyone got my point.



Intern
Joined: 26 May 2016
Posts: 20

Re: M0603
[#permalink]
Show Tags
02 May 2017, 02:13
Bunuel wrote: The first flight out of Phoenix airport had a late departure. If the next three flights departed ontime, how many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%?
A. 6 B. 7 C. 9 D. 10 E. 11 Here's my take on this: Current stat: 1 on time 3 late current % of on time departure: 3/4 = 75% We need >90%, hence let's keep adding more flights that departed on time. (3+1)/(4+1) = 4/5 = 80% not over to 90% (3+2)/(4+2) = 5/6 not over to 90% (3+3)/(4+3) = 6/7 not over to 90% (3+4)/(4+4) = 7/8 not over to 90% (3+5)/(4+5) = 8/9 not over to 90% (3+6)/(4+6) = 9/10 = 90% not over to 90% (3+7)/(4+7) = 10/11 just over to 90% Hence 7 is the answer.



Director
Joined: 02 Sep 2016
Posts: 678

Re: M0603
[#permalink]
Show Tags
06 Sep 2017, 01:24
Bunuel and abhimahnaWhat I understood from this question was: Total= 4 flights (till now) On time= 3 Therefore 3/4*100= 75% on time For this percentage to be >90%: If 6 more flights take off on time, then there will be total 6+3 flights that took off on time. Total= 6+3+1= 10 On time= 9 Percentage= 9/10*100 = 90% What did I miss? Is it the "subsequent" information that I misinterpreted?
_________________
Help me make my explanation better by providing a logical feedback.
If you liked the post, HIT KUDOS !!
Don't quit.............Do it.



Director
Joined: 02 Sep 2016
Posts: 678

Re: M0603
[#permalink]
Show Tags
06 Sep 2017, 01:26
I think I somewhat get it: We need more than 90% and option A gives exactly 90%.
_________________
Help me make my explanation better by providing a logical feedback.
If you liked the post, HIT KUDOS !!
Don't quit.............Do it.



Senior Manager
Joined: 17 Mar 2014
Posts: 422

Re: M0603
[#permalink]
Show Tags
02 Jan 2018, 21:17
Bunuel wrote: Official Solution:
The first flight out of Phoenix airport had a late departure. If the next three flights departed ontime, how many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%?
A. 6 B. 7 C. 9 D. 10 E. 11
We need ontime departure rate to be higher than \(\frac{9}{10}\), so it should be at least \(\frac{10}{11}\), which means that 10 out of 11 flights must depart on time. Since for now 3 out of 4 flights departed on time then \(103=7\) subsequent flights need to depart ontime.
Answer: B Bunuel, could you explain how did you come to 10/11. I am not able to get above highlighted red part.



Math Expert
Joined: 02 Sep 2009
Posts: 52385

Re: M0603
[#permalink]
Show Tags
02 Jan 2018, 22:27
ammuseeru wrote: Bunuel wrote: Official Solution:
The first flight out of Phoenix airport had a late departure. If the next three flights departed ontime, how many subsequent flights need to depart from Phoenix ontime, for the airport's ontime departure rate to be higher than 90%?
A. 6 B. 7 C. 9 D. 10 E. 11
We need ontime departure rate to be higher than \(\frac{9}{10}\), so it should be at least \(\frac{10}{11}\), which means that 10 out of 11 flights must depart on time. Since for now 3 out of 4 flights departed on time then \(103=7\) subsequent flights need to depart ontime.
Answer: B Bunuel, could you explain how did you come to 10/11. I am not able to get above highlighted red part. We need (ontime departures)/(total departures) to be greater than 9/10. Next, fraction, which is greater than 9/10 (having both numerator and denominator integers) is 10/11: 9/10 < 10/11 < 11/12 < ... 9/10 < 10/11 < 91/100 < ...
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics










