In a stack of boards at a lumber yard, the 20th board : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 20 Feb 2017, 19:53

### 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

# 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

Senior Manager
Joined: 22 Sep 2005
Posts: 276
Followers: 1

Kudos [?]: 194 [0], given: 1

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

### Show Tags

14 Nov 2006, 12:59
14
This post was
BOOKMARKED
00:00

Difficulty:

45% (medium)

Question Stats:

52% (01:39) correct 48% (00:44) wrong based on 650 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, 04:12, edited 2 times in total.
OA added.
Senior Manager
Joined: 08 Jun 2006
Posts: 340
Location: Washington DC
Followers: 1

Kudos [?]: 52 [0], given: 0

### Show Tags

14 Nov 2006, 13:32
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
Joined: 29 Aug 2006
Posts: 157
Followers: 1

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

### Show Tags

14 Nov 2006, 13:42
This is where I generally tend to make mistakes, hence I do it the manual way.
VP
Joined: 21 Aug 2006
Posts: 1025
Followers: 1

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

### Show Tags

15 Nov 2006, 05:57
16 th above 20th..

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

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

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

Kudos [?]: 119 [0], given: 1

### Show Tags

21 Nov 2006, 15:12
Algebraically:
x-19=15
x=34
Senior Manager
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

21 Nov 2006, 23:10
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
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

02 Sep 2012, 07:17
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
Math Expert
Joined: 02 Sep 2009
Posts: 37038
Followers: 7233

Kudos [?]: 96166 [6] , given: 10707

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

### Show Tags

03 Sep 2012, 04:18
6
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.
_________________
Manager
Joined: 16 Feb 2012
Posts: 237
Concentration: Finance, Economics
Followers: 7

Kudos [?]: 293 [0], given: 121

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

### Show Tags

04 Sep 2012, 02:52
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
Joined: 09 Sep 2013
Posts: 13884
Followers: 589

Kudos [?]: 167 [0], given: 0

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

### Show Tags

29 Jan 2014, 08:27
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.
_________________
Manager
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

19 Feb 2015, 08:02
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
Intern
Joined: 12 May 2013
Posts: 10
GPA: 3.7
Followers: 0

Kudos [?]: 6 [0], given: 7

Stack of boards [#permalink]

### Show Tags

18 Oct 2015, 08:29
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.
Math Expert
Joined: 02 Sep 2009
Posts: 37038
Followers: 7233

Kudos [?]: 96166 [0], given: 10707

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

### Show Tags

18 Oct 2015, 08:38
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.

Merging topics. Please refer to the discussion above.

Also, please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Thank you.
_________________
Optimus Prep Instructor
Joined: 06 Nov 2014
Posts: 1787
Followers: 53

Kudos [?]: 401 [0], given: 21

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

### Show Tags

18 Oct 2015, 11:18
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
Joined: 09 Sep 2013
Posts: 13884
Followers: 589

Kudos [?]: 167 [0], given: 0

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

### Show Tags

07 Jan 2017, 06:41
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.
_________________
Re: In a stack of boards at a lumber yard, the 20th board   [#permalink] 07 Jan 2017, 06:41
Similar topics Replies Last post
Similar
Topics:
3 A teacher writes 3^4 on the board 5 14 Jan 2016, 00:38
2 In a circuit board factory, all circuit boards that pass 2 10 Jan 2014, 01:49
1 In a stack of boards at a lumber yard, the 20th board counting from th 1 17 Jun 2011, 04:09
62 Anthony and Michael sit on the six member board of directors 43 23 Jan 2008, 06:12
15 Anthony and Michael sit on the six-member board of directors 21 02 Jan 2008, 13:50
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

 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®.