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

It is currently 16 Sep 2014, 11:39

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

In a stack of boards at a lumber yard, the 20th board

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 12 Nov 2007
Posts: 3
Followers: 0

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

In a stack of boards at a lumber yard, the 20th board [#permalink] New post 12 Nov 2007, 19:45
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?

A 38
B 36
C 35
D 34
E 32

I can find the answer easily enough by writing down all the numbers and back solving using the answers, but there has to be an easier way to attack this problem. Any ideas?
Manager
Manager
avatar
Joined: 25 Jul 2007
Posts: 108
Followers: 1

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 12 Nov 2007, 19:57
There is no need to backsolve.

We will call our board B. It says that the board is 20th from the top of the stack.
i.e:

19
B
..
...

It also says that this board B is one below the 16th board from the bottom. i.e. it is the 15th board from the bottom.

19
B
14

19+B+14=34 boards in the stack.

Hope this helps.
Director
Director
avatar
Joined: 09 Aug 2006
Posts: 767
Followers: 1

Kudos [?]: 49 [0], given: 0

GMAT Tests User
Re: Counting Problems [#permalink] New post 12 Nov 2007, 20:26
showtime12 wrote:
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?

A 38
B 36
C 35
D 34
E 32

I can find the answer easily enough by writing down all the numbers and back solving using the answers, but there has to be an easier way to attack this problem. Any ideas?


From the top, the board after the 19th board, i.e., the 20th board from the top is the 15th board from the bottom. Total boards = 19 + 15 = 34.
Intern
Intern
avatar
Joined: 12 Nov 2007
Posts: 3
Followers: 0

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

Re: Counting Problems [#permalink] New post 13 Nov 2007, 11:38
That makes sense. Thanks

showtime12 wrote:
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?

A 38
B 36
C 35
D 34
E 32

I can find the answer easily enough by writing down all the numbers and back solving using the answers, but there has to be an easier way to attack this problem. Any ideas?
Re: Counting Problems   [#permalink] 13 Nov 2007, 11:38
    Similar topics Author Replies Last post
Similar
Topics:
1 Stack of Boards Baten80 1 17 Jun 2011, 04:09
24 Experts publish their posts in the topic As the former chair of the planning board for 18 consecutive neeshpal 17 08 Sep 2008, 18:24
Stack of boards Qs Summer3 2 24 Mar 2007, 19:13
3 Experts publish their posts in the topic In a stack of boards at a lumber yard, the 20th board netcaesar 9 14 Nov 2006, 12:59
Board member: As a longtime member of the college's board of qhoc0010 3 29 Jan 2005, 13:37
Display posts from previous: Sort by

In a stack of boards at a lumber yard, the 20th board

  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®.