GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 19 Feb 2019, 05:02

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
  • Free GMAT Prep Hour

     February 20, 2019

     February 20, 2019

     08:00 PM EST

     09:00 PM EST

    Strategies and techniques for approaching featured GMAT topics. Wednesday, February 20th at 8 PM EST
  • Online GMAT boot camp for FREE

     February 21, 2019

     February 21, 2019

     10:00 PM PST

     11:00 PM PST

    Kick off your 2019 GMAT prep with a free 7-day boot camp that includes free online lessons, webinars, and a full GMAT course access. Limited for the first 99 registrants! Feb. 21st until the 27th.

The seating chart of an airplane shows 30 rows of seats

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Manager
Manager
avatar
Joined: 31 Oct 2011
Posts: 229
The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 24 Feb 2012, 22:09
2
2
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

54% (01:56) correct 46% (02:16) wrong based on 147 sessions

HideShow timer Statistics

The seating chart of an airplane shows 30 rows of seats. Each row has 3 seats on each side of the center aisle, and one of the seats on each side is a window saet. The view from the window seats in 5 of the rows is obscured by the wings of the airplane. If the first person to be assigned a seat is assigned a window seat and thw window seat is assigned randomly, what is the probability that the person will get a seat with an unobscured view?

A. 1/6
B. 1/3
C. 2/3
D. 5/6
E. 17/18
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52971
Re: PT # 8 PS 2 Q 19  [#permalink]

Show Tags

New post 24 Feb 2012, 22:20
1
1
eybrj2 wrote:
The seating chart of an airplane shows 30 rows of seats. Each row has 3 seats on each side of the center aisle, and one of the seats on each side is a window saet. The view from the window seats in 5 of the rows is obscured by the wings of the airplane. If the first person to be assigned a seat is assigned a window seat and thw window seat is assigned randomly, what is the probability that the person will get a seat with an unobscured view?

A. 1/6
B. 1/3
C. 2/3
D. 5/6
E. 17/ 18


Total # of seats is 30*3=90;
# of seats with obscured view is 5*3=15, hence # of seat with unobscured view is 90-15=75;

P=favorable/total=75/90=5/6.

Answer: D.
_________________

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?
Extra-hard Quant Tests with Brilliant Analytics

Intern
Intern
avatar
Joined: 09 Feb 2012
Posts: 14
Concentration: Strategy, General Management
GMAT 1: 640 Q44 V34
GPA: 3.8
GMAT ToolKit User
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 24 Mar 2012, 22:38
Hey, i also got D.But my approach was different.Please correct me if i am wrong..

A person can be chosen from 30 window seats in 30C1 ways.
Now ,if we choose a person who sits in those 5 window seats which are obscured,we can do that in 5C1 ways
So probability(seating in a obscured seat)=5C1/30C1=5/30=1/6
Thus probability(seating in a non obscured seat)=1-1/6=5/6
Manager
Manager
avatar
Joined: 10 Nov 2010
Posts: 184
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 01 Apr 2012, 03:26
Pls correct if m wrong

Total number of window seats 30+30 = 60(on both sides of the aisle
Obscured on both sides 5+5 =10
Unobscured on both sides =50

Probability = unobscured /total window seats
50/60 = 5/6
_________________

The proof of understanding is the ability to explain it.

Manager
Manager
avatar
Status: May The Force Be With Me (D-DAY 15 May 2012)
Joined: 06 Jan 2012
Posts: 210
Location: India
Concentration: General Management, Entrepreneurship
Reviews Badge
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 01 Apr 2012, 04:22
+1 D.... Finally I got a probability sum correct :-P
_________________

Giving +1 kudos is a better way of saying 'Thank You'.

Manager
Manager
avatar
Joined: 16 May 2011
Posts: 57
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 01 Apr 2012, 15:09
How come you didn't consider 6 seats per row? Isn't that what is stated in the question? I know the numbers workout the same but still.

# of Total seats = 30(3)(2) = 180

Window seats = 60
Obstructed view window seat = 10

Since the question tells us that a window seat was obtained, all we care about are the window seats

Therefore probability of unobstructed view = 60-10/60 = 5/6 D

Is this reason of thinking correct? or the above is better?
Intern
Intern
avatar
Joined: 03 Dec 2010
Posts: 21
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 04 Apr 2012, 07:36
Hi Bunuel,

I've a doubt here "Each row has 3 seats on each side of the center aisle, and one of the seats on each side is a window saet. The view from the window seats in 5 of the rows is obscured by the wings of the airplane."

So what I've understood is that in each row= 3 seats (Left, Center, Right), and ONE of them has window, (Left or Right only). So if each window has obscured view, ie. in total there are = 1 obscoured seat *5 rows= 5 seats with obscoured view.
There are total 90 seats, so 85 seats have unobscured view. Hence, 85/90.

Pls explain.
Manager
Manager
avatar
Joined: 16 May 2011
Posts: 57
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 04 Apr 2012, 11:34
priyalr

6 seats per row, think of a boeing 737. We have 30 rows, therefore window 30 seats one one side and 30 window seats on the other, totaling 60 window seats on the whole plane.

the view of the window of 5 rows is blocked. two wings, therefore 10 window seats are blocked.

Total window seats = 60
Total blocked window seats = 10
Total unblocked seats = 50

We know that a window seat was given, therefore probability for not window seat is 50/60 =5/6

ANS DEEEEEE
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 9845
Premium Member
Re: The seating chart of an airplane shows 30 rows of seats  [#permalink]

Show Tags

New post 21 Oct 2018, 21:03
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

GMAT Club Bot
Re: The seating chart of an airplane shows 30 rows of seats   [#permalink] 21 Oct 2018, 21:03
Display posts from previous: Sort by

The seating chart of an airplane shows 30 rows of seats

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.