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

It is currently 30 Sep 2014, 02:04

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If the two floors in a certain building are 9 feet apart

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 01 May 2007
Posts: 795
Followers: 1

Kudos [?]: 74 [0], given: 0

If the two floors in a certain building are 9 feet apart [#permalink] New post 08 Apr 2008, 15:23
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

83% (01:30) correct 17% (00:28) wrong based on 99 sessions
If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(1) Each step is 3/4 foot high.
(2) Each step is 1 foot wide.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-the-two-floors-in-a-certain-building-are-9-feet-apart-136198.html
[Reveal] Spoiler: OA
Kaplan Promo CodeKnewton GMAT Discount CodesManhattan GMAT Discount Codes
Director
Director
User avatar
Joined: 20 Feb 2008
Posts: 797
Location: Texas
Schools: Kellogg Class of 2011
Followers: 5

Kudos [?]: 145 [0], given: 9

Re: DS OG: Geometry [#permalink] New post 08 Apr 2008, 17:36
The answer is A. There are 12 steps between the floors. The second answer only states how wide the steps are, they could be 1 inch high or 9 feet high, either way we don't know which.
2 KUDOS received
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 18

Kudos [?]: 294 [2] , given: 1

Premium Member CAT Tests
Re: DS OG: Geometry [#permalink] New post 08 Apr 2008, 18:23
2
This post received
KUDOS
jimmyjamesdonkey wrote:
If the two floors in a certain building at 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

1) Each step is 3/4 foot high
2) Each step is 1 foot wide


Here is my logic

"foot high" so you know something upward the sky, that is, the direction from the first to the second floor. But "foot wide", you can only know the direction toward the ocean. :lol: :lol: :lol:

A win
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Director
Director
avatar
Joined: 01 May 2007
Posts: 795
Followers: 1

Kudos [?]: 74 [0], given: 0

Re: DS OG: Geometry [#permalink] New post 09 Apr 2008, 18:50
A is the right answer, but can someone explain to me why we do not need to know the rise and run of steps?
Director
Director
User avatar
Joined: 20 Feb 2008
Posts: 797
Location: Texas
Schools: Kellogg Class of 2011
Followers: 5

Kudos [?]: 145 [0], given: 9

Re: DS OG: Geometry [#permalink] New post 09 Apr 2008, 20:34
Think of a really long set of stairs 9 feet high or a really steep set of stairs 9 feet high. The depth of the stairs determines how far horizontally the first stair is from the top stair. The shorter the width of the stairs, the steeper the set of steps. This has nothing to do with the height of each step. The width is the part you step on and the height is the baseboard you see when you are walking up the stairs (also the vertical board).
Manager
Manager
avatar
Joined: 10 Aug 2009
Posts: 123
Followers: 3

Kudos [?]: 13 [0], given: 13

Re: Relatively simple question (logic & geometry I think) [#permalink] New post 18 Feb 2010, 07:16
Ok I can see that even if it zig zags the number of stairs will be the same BUT thats only if we assume that the next stair begins where the previous one ends (height wise)

Edit: the answer explanation states what I expected, that 1 is sufficient because you can get the number of steps by dividing the total height by the height of each step, but again how do I know that we can assume this?
Manager
Manager
avatar
Joined: 26 May 2005
Posts: 210
Followers: 2

Kudos [?]: 69 [0], given: 1

Re: Relatively simple question (logic & geometry I think) [#permalink] New post 18 Feb 2010, 09:04
as the question said that it extends from first fl to second fl .. means count anything that goes upwards
Senior Manager
Senior Manager
User avatar
Joined: 13 Dec 2009
Posts: 264
Followers: 10

Kudos [?]: 107 [0], given: 13

Reviews Badge
Re: Relatively simple question (logic & geometry I think) [#permalink] New post 12 Mar 2010, 01:10
nickk wrote:
From OG 12th edition:

If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(1) Each step is 3/4 of a foot high
(2) Each step is 1 foot wide

OA:
[Reveal] Spoiler:
A


I thought it was
[Reveal] Spoiler:
E
because the stairway can be extended in many different ways, e.g. at different slopes, or it can even go up in one direction, and then in the other (sort of zig-zag). Also, each consecutive stair doesn't have to extend by its full height.
I guess if you assume that the stairs are placed in one direction, and the next begins where the previous ends (height wise) then A is the answer, but to me it seems that this assumption was not explicated in the question.



The distance given between two floors is in height, not slope or width. so if we consider 1st and 2nd floor it is the height which is 9 ft between both of them. SO how much ever slope we will give to the stairs their height should sum to 9 ft dats y we can conclude from the first point dat no of stairs = 9 ft / 3/4 ft
or 12 sets. This is why A is the answer.
_________________

My debrief: done-and-dusted-730-q49-v40

CEO
CEO
User avatar
Joined: 09 Sep 2013
Posts: 2543
Followers: 199

Kudos [?]: 40 [0], given: 0

Premium Member
Re: If the two floors in a certain building are 9 feet apart [#permalink] New post 20 May 2014, 09:29
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

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23055
Followers: 3535

Kudos [?]: 27190 [0], given: 2725

Re: If the two floors in a certain building are 9 feet apart [#permalink] New post 21 May 2014, 01:07
Expert's post
If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building?

(1) Each step is 3/4 foot high. Since each step is 3/4 foot high and the stairs rises 9 feet from the first floor to the second, the number of steps must be \frac{9}{(\frac{3}{4})}=12. Sufficient.

(2) Each step is 1 foot wide. Clearly insufficient.

Answer: A.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-the-two-floors-in-a-certain-building-are-9-feet-apart-136198.html
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: If the two floors in a certain building are 9 feet apart   [#permalink] 21 May 2014, 01:07
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic If the two floors in a certain building are 9 feet apart Bunuel 1 23 Jul 2012, 03:48
Each of the offices in a certain building has a floor area netcaesar 2 23 Jan 2008, 13:46
A building with 600 floors has two elevators. The floors lfox2 6 12 Dec 2006, 00:02
1 Experts publish their posts in the topic Each of the offices in a certain building has a floor area wshaffer 6 18 Sep 2006, 16:31
SC apartment building - please explain qhoc0010 3 09 Nov 2004, 05:40
Display posts from previous: Sort by

If the two floors in a certain building are 9 feet apart

  Question banks Downloads My Bookmarks Reviews Important topics  


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

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®.