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

Manager
Joined: 27 Oct 2011
Posts: 135
Location: United States
Concentration: Finance, Strategy
GPA: 3.7
WE: Account Management (Consumer Products)

In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
05 Feb 2012, 16:00
Question Stats:
46% (02:07) correct 54% (01:55) wrong based on 242 sessions
HideShow timer Statistics
In a particular aircraft, there must be 9 seats across, and two aisles. If the dash symbols represent aisles, which of the following arrangements provides the lowest average number of seats between passengers and the closest aisle? a) 171 b) 252 c) 333 d) 414 e) all of the above arrangements produce the same average distance from the closest aisle.
Official Answer and Stats are available only to registered users. Register/ Login.
_________________
DETERMINED TO BREAK 700!!!



Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4485

Re: Airplane seats.
[#permalink]
Show Tags
05 Feb 2012, 17:47
Hi, there. I'm happy to help with this. Answer A: 171 Well, the two on the far ends, and the two at the ends of the seven are all on the aisle, no one between them and the aisle. 0, 0, _, _, _, _, _, 0, 0 Next person in on each side of that row of seven has one person between her and the aisle. 0, 0, 1, _, _, _, 1, 0, 0 Next person in on each side has two people between him and the aisle: 0, 0, 1, 2, _, 2, 1, 0, 0 Person in the center has three people between her and the aisle on either side. 0, 0, 1, 2, 3, 2, 1, 0, 0 > SUM = 9 ( since we would divide by nine in each case, we can just find the sum  lowest sum will be the lowest average). Answer B: 252 Similar logic: 1, 0, 0, 1, 2, 1, 0, 0, 1 > SUM = 6 Answer C: 333 2, 1, 0, 0, 1, 0, 0, 1, 2 > SUM = 7 Answer D: 414 3, 2, 1, 0, 0, 0, 1, 2, 3 > SUM 12 So, they don't all have the same average. (b) has the lowest sum, so it has the lowest average. Does that make sense? Please let me know if you have any questions on this. Mike
_________________
Mike McGarry Magoosh Test Prep
Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)



Manager
Joined: 08 Nov 2014
Posts: 83
Location: India
GPA: 3
WE: Engineering (Manufacturing)

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
20 Apr 2015, 12:05
Please explain the question , I cannot understand or visualize it
_________________
"Arise, Awake and Stop not till the goal is reached"



EMPOWERgmat Instructor
Status: GMAT Assassin/CoFounder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 13375
Location: United States (CA)

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
20 Apr 2015, 17:34
Hi veerdonjuan, The answer choices give us 4 possible 'arrangements' of seats and aisles in one row of an airplane (the dashes represent where the aisles would be). From any given seat, there are a certain number of seats between that seat and the nearest aisle. We're asked to figure out which arrangement would give us the SMALLEST AVERAGE number of seats between a seat and the closest aisle. Mike's approach was to "map out" the possibilities, which is essentially what you have to do to get to the correct answer. Here's how the calculation is set up for each answer: I'm going to use "S" to represent a seat and "a" to represent an aisle. In Answer A, we have..... S a S S S S S S S a S Working from lefttoright.... The 1st S has 0 seats between it and the nearest aisle The 2nd S has 0 seats between it and the nearest aisle The 3rd S has 1 seat between it and the nearest aisle The 4th S has 2 seats between it and the nearest aisle The 5th S has 3 seats between it and the nearest aisle The 6th S has 2 seats between it and the nearest aisle The 7th S has 1 seats between it and the nearest aisle The 8th S has 0 seats between it and the nearest aisle The 9th S has 0 seats between it and the nearest aisle Total = 0+0+1+2+3+2+1+0+0 = 9 So the AVERAGE number of seats between any seat and the closest aisle in this arrangement is = 9/9 = 1 Since we're asked to find the SMALLEST AVERAGE, we need the smallest SUM. Working through the other 3 options will get you the answer. GMAT assassins aren't born, they're made, Rich
_________________
760+: Learn What GMAT Assassins Do to Score at the Highest Levels Contact Rich at: Rich.C@empowergmat.com
Rich Cohen
CoFounder & GMAT Assassin
Special Offer: Save $75 + GMAT Club Tests Free
Official GMAT Exam Packs + 70 Pt. Improvement Guarantee www.empowergmat.com/
*****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*****



Intern
Joined: 03 Jul 2015
Posts: 31

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
08 Oct 2015, 06:13
mikemcgarry wrote: Hi, there. I'm happy to help with this. Answer A: 171 Well, the two on the far ends, and the two at the ends of the seven are all on the aisle, no one between them and the aisle. 0, 0, _, _, _, _, _, 0, 0 Next person in on each side of that row of seven has one person between her and the aisle. 0, 0, 1, _, _, _, 1, 0, 0 Next person in on each side has two people between him and the aisle: 0, 0, 1, 2, _, 2, 1, 0, 0 Person in the center has three people between her and the aisle on either side. 0, 0, 1, 2, 3, 2, 1, 0, 0 > SUM = 9 ( since we would divide by nine in each case, we can just find the sum  lowest sum will be the lowest average). Answer B: 252 Similar logic: 1, 0, 0, 1, 2, 1, 0, 0, 1 > SUM = 6 Answer C: 333 2, 1, 0, 0, 1, 0, 0, 1, 2 > SUM = 7 Answer D: 414 3, 2, 1, 0, 0, 0, 1, 2, 3 > SUM 12 So, they don't all have the same average. (b) has the lowest sum, so it has the lowest average. Does that make sense? Please let me know if you have any questions on this. Mike i can not understan how you have put numbers at the two ends and you made this arrange ment. please elaborate how you made this arrange ment



Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4485

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
08 Oct 2015, 09:10
anik19890 wrote: i can not understan how you have put numbers at the two ends and you made this arrange ment. please elaborate how you made this arrange ment Dear anik19890, I'm happy to respond. First and foremost, this is a visual question. If you are not visualizing the five different arrangements of seats, then none of the numbers are going to make any sense. I would say that the first step for you is to get out pencil and paper and physically, on paper, draw out the five arrangements of seats. It's important to draw it out with your hands, so you can engage the tactile as well as visual components of your brain. Once you have diagrams for the five arrangements of seats, then you start by putting a zero in any seat next to the aisle, because such a seat is zero seats from the aisle. Once you have all these diagram drawn out and have labeled your zeros, come back to this page and read through my solution again. Does this make sense? Mike
_________________
Mike McGarry Magoosh Test Prep
Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)



Manager
Joined: 23 Sep 2016
Posts: 94

In a particular aircraft, there must be 9 seats across, and two aisles
[#permalink]
Show Tags
11 Nov 2016, 10:51
In a particular aircraft, there must be 9 seats across, and two aisles. If the dash symbols represent aisles, which of the following arrangements provides the lowest average number of seats between passengers and the closest aisle?
A) 171 B) 252 C) 333 D) 414 E) all of the above arrangements produce the same average distance from the closest aisle



Manager
Joined: 29 Dec 2014
Posts: 67

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
15 Nov 2016, 18:13
Given the calculation intensive nature of the question, is it representative of the questions asked on the GMAT



NonHuman User
Joined: 09 Sep 2013
Posts: 9461

Re: In a particular aircraft, there must be 9 seats across, and
[#permalink]
Show Tags
13 May 2018, 02:59
Hello from the GMAT Club BumpBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up  doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books  GMAT Club Tests  Best Prices on GMAT Courses  GMAT Mobile App  Math Resources  Verbal Resources




Re: In a particular aircraft, there must be 9 seats across, and &nbs
[#permalink]
13 May 2018, 02:59






