Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

It is currently 24 May 2017, 11:23

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

Events & Promotions in June
Open Detailed Calendar

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

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

Hide Tags

3 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 22 Sep 2005
Posts: 276
Followers: 1

Kudos [?]: 208 [3] , given: 1

In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 14 Nov 2006, 13:59
3
This post received
KUDOS
14
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

53% (01:40) correct 47% (00:42) wrong based on 708 sessions

HideShow timer Statistics

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
[Reveal] Spoiler: OA

Last edited by Bunuel on 03 Sep 2012, 05:12, edited 2 times in total.
OA added.
Senior Manager
Senior Manager
avatar
Joined: 08 Jun 2006
Posts: 337
Location: Washington DC
Followers: 1

Kudos [?]: 54 [0], given: 0

 [#permalink]

Show Tags

New post 14 Nov 2006, 14:32
2
This post was
BOOKMARKED
20th board from top is 15th (immediately below the 16th board) from bottom. Therefore, there are 14 more boards below the 20th board (from top).
Total number of boards = 34
Manager
Manager
avatar
Joined: 29 Aug 2006
Posts: 156
Followers: 1

Kudos [?]: 6 [0], given: 0

 [#permalink]

Show Tags

New post 14 Nov 2006, 14:42
This is where I generally tend to make mistakes, hence I do it the manual way.
VP
VP
User avatar
Joined: 21 Aug 2006
Posts: 1019
Followers: 1

Kudos [?]: 31 [0], given: 0

 [#permalink]

Show Tags

New post 15 Nov 2006, 06:57
16 th above 20th..

so 20th is 15th..there are 14 under that..total is 34 :-D
_________________

The path is long, but self-surrender makes it short;
the way is difficult, but perfect trust makes it easy.

Director
Director
avatar
Joined: 12 Jun 2006
Posts: 532
Followers: 2

Kudos [?]: 123 [0], given: 1

 [#permalink]

Show Tags

New post 21 Nov 2006, 16:12
Algebraically:
x-19=15
x=34
Senior Manager
Senior Manager
User avatar
Joined: 01 Sep 2006
Posts: 301
Location: Phoenix, AZ, USA
Followers: 1

Kudos [?]: 26 [0], given: 0

Re: PS: Stack of boards [#permalink]

Show Tags

New post 22 Nov 2006, 00:10
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

123456789 10 11 12 13 14 15 16 17 18 19 20
16 15 14 13 .... 1

18+16=34
Intern
Intern
avatar
Joined: 08 Jan 2012
Posts: 7
Followers: 0

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

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 02 Sep 2012, 08:17
Guys,

Im confused with the phrase "immediately below 16 from the bottom". When you count something and you say immediately below something doesnt that it mean next number in the counting. In this example it will be 17th. How do you guys say it is 15th from the bottom?

Any clarification will help on Tuesday attempt.

Thanks
Expert Post
7 KUDOS received
Math Expert
User avatar
P
Joined: 02 Sep 2009
Posts: 38856
Followers: 7725

Kudos [?]: 106028 [7] , given: 11602

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 03 Sep 2012, 05:18
7
This post received
KUDOS
Expert's post
4
This post was
BOOKMARKED
vidhya16 wrote:
Guys,

Im confused with the phrase "immediately below 16 from the bottom". When you count something and you say immediately below something doesnt that it mean next number in the counting. In this example it will be 17th. How do you guys say it is 15th from the bottom?

Any clarification will help on Tuesday attempt.

Thanks


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

There are some number of boards stacked.

20th board from the top is immediately below the 16th board from the bottom:

1
2
3
.
.
.
16
20 15
14
13
.
.
.
3
2
1


As you can see 20th board from the top is immediately below the 16th board from the bottom. The total number of boards 20(red)+14(blue)=34.

Answer: D.
_________________

New to the Math Forum?
Please read this: 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

Manager
Manager
avatar
Joined: 16 Feb 2012
Posts: 232
Concentration: Finance, Economics
Followers: 7

Kudos [?]: 326 [0], given: 121

GMAT ToolKit User
Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 04 Sep 2012, 03:52
20th from the top is 15th form the bottom, so there are 14 more boards below the first 20...which is 34 total.
_________________

Kudos if you like the post!

Failing to plan is planning to fail.

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 15428
Followers: 649

Kudos [?]: 207 [0], given: 0

Premium Member
Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 29 Jan 2014, 09:27
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

Manager
Manager
User avatar
Joined: 25 Apr 2013
Posts: 68
Followers: 0

Kudos [?]: 18 [0], given: 12

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 19 Feb 2015, 09:02
We can actually quickly try it out with lesser number of planks.

Say 4th from the top is immediately below 3rd from the bottom.

-------------
-------------
-------------
-------------
-------------

Total number of planks = 4+3-2 = 5

This in fact would be the case with any plank. For example, 3rd from the top is below 4th from the bottom.

Total number of planks = 3+4-2 = 5

Here, 20th from the top is below 16th from the bottom
-> Total number of planks = 20+16-2 = 34
Expert Post
Optimus Prep Instructor
User avatar
B
Joined: 06 Nov 2014
Posts: 1812
Followers: 55

Kudos [?]: 441 [0], given: 22

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 18 Oct 2015, 12:18
novice12 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

Please support your answer with explanation.


We need the 20th board, when we start counting from the top.
This board is immediately below the 16th board from the bottom. i.e. This is the 15th board from the bottom
Hence we have 14 more boards below this.

Total number of boards = 14(No. of boards below the one in consideration) + 20(No. of boards above the one in consideration) = 34 Option D
_________________

Janielle Williams

Customer Support

Special Offer: $80-100/hr. Online Private Tutoring
GMAT On Demand Course $299
Free Online Trial Hour

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 15428
Followers: 649

Kudos [?]: 207 [0], given: 0

Premium Member
Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 07 Jan 2017, 07:41
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

Intern
Intern
avatar
B
Joined: 29 Oct 2016
Posts: 12
Followers: 1

Kudos [?]: 1 [0], given: 8

Re: In a stack of boards at a lumber yard, the 20th board [#permalink]

Show Tags

New post 06 May 2017, 12:42
I'm not entirely sure what this is testing. Is this a pure logic question? Can we expect to see more questions like this on the GMAT and do we have any additional related practice problems?

Thanks!
Re: In a stack of boards at a lumber yard, the 20th board   [#permalink] 06 May 2017, 12:42
    Similar topics Author Replies Last post
Similar
Topics:
4 Experts publish their posts in the topic A teacher writes 3^4 on the board chetan2u 6 18 May 2017, 23:38
2 In a circuit board factory, all circuit boards that pass BabySmurf 2 15 Jun 2016, 16:25
1 In a stack of boards at a lumber yard, the 20th board counting from th Baten80 1 17 Jun 2011, 13:08
64 Experts publish their posts in the topic Anthony and Michael sit on the six member board of directors kamilaak 43 20 Jul 2012, 07:57
17 Experts publish their posts in the topic Anthony and Michael sit on the six-member board of directors aliensoybean 21 15 Jul 2013, 14:14
Display posts from previous: Sort by

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

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


GMAT Club MBA Forum Home| About| 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®.