Last visit was: 24 Apr 2026, 04:54 It is currently 24 Apr 2026, 04:54
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
shyind
User avatar
Joined: 26 Nov 2014
Last visit: 28 Dec 2015
Posts: 71
Own Kudos:
526
 [17]
Given Kudos: 8
Products:
My Reviews
Posts: 71
Kudos: 526
 [17]
A straight fence is to be constructed from posts 6 inches wide and sep 09 Aug 2015, 03:22
2
Kudos
Add Kudos
15
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

55% (hard)

Question Stats:

63% (02:19) correct 37% (02:31) wrong based on 185 sessions

History

Date
Time
Result
Not Attempted Yet
A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)

A. 17
B. 28
C. 35
D. 39
E. 50
ShowHide Answer
Official Answer
C
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,811
Own Kudos:
810,948
 [7]
Given Kudos: 105,869
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,811
Kudos: 810,948
 [7]
A straight fence is to be constructed from posts 6 inches wide and sep 16 Aug 2015, 16:33
4
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
shyind
A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)

A. 17
B. 28
C. 35
D. 39
E. 50
Show more

The fence begins and ends with a post: {post = 0.5 feet}{chains = 5 feet}{post = 0.5 feet}...{chains = 5 feet}{post = 0.5 feet}

The minimum length is with 2 posts = 0.5 + 5 + 0.5 = 6 feet. To increase the fence, each time we should add{post = 0.5 feet}{chains = 5 feet}, so 5.5 feet. Thus, the lengths could be:

6 feet;
6 + 5.5 = 11.5 feet;
11.5 + 5.5 = 17 feet;
17 + 5.5 = 22.5 feet;
22.5 + 5.5 = 28 feet;
28 + 5.5 = 33.5 feet;
33.5 + 5.5 = 39 feet.
...

We skipped 35 feet.

Answer: C.

Or: options A, B, D and E are in A.P. 17, 28, 39, 50 (common difference 11). 35 clearly doesn't belong to this pattern.
General Discussion
User avatar
Shruti0805
User avatar
Joined: 24 Dec 2016
Last visit: 02 Sep 2021
Posts: 91
Own Kudos:
49
 [1]
Given Kudos: 145
Location: India
Concentration: Finance, General Management
Schools: Simon '21 (A$) Carlson '21 (A$) McDonough '21 (A)
WE:Information Technology (Computer Software)
Schools: Simon '21 (A$) Carlson '21 (A$) McDonough '21 (A)
Posts: 91
Kudos: 49
 [1]
A straight fence is to be constructed from posts 6 inches wide and sep 08 Mar 2017, 20:10
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
shyind
A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)

A. 17
B. 28
C. 35
D. 39
E. 50
Show more

As the qsn mandates that we have a post at the start and end of the fence, fence can be in format :
PCP
PCPCP
PCPCPCP, etc.

we can quickly deduce that the no. of posts would be 1 more than the no. of chains.
So, lets take #Chains = n and #Posts = (n+1)

Thus, our total length of fence = 5n + .5(n+1) feet.

Equate it with the lengths mentioned in the solution, only C doesn't satisfy.
avatar
menonrit
avatar
Joined: 07 May 2018
Last visit: 07 Jul 2019
Posts: 33
Own Kudos:
8
Given Kudos: 12
Posts: 33
Kudos: 8
A straight fence is to be constructed from posts 6 inches wide and sep 12 Jul 2018, 05:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
shyind
A straight fence is to be constructed from posts 6 inches wide and separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)

A. 17
B. 28
C. 35
D. 39
E. 50

The fence begins and ends with a post: {post = 0.5 feet}{chains = 5 feet}{post = 0.5 feet}...{chains = 5 feet}{post = 0.5 feet}

The minimum length is with 2 posts = 0.5 + 5 + 0.5 = 6 feet. To increase the fence, each time we should add{post = 0.5 feet}{chains = 5 feet}, so 5.5 feet. Thus, the lengths could be:

6 feet;
6 + 5.5 = 11.5 feet;
11.5 + 5.5 = 17 feet;
17 + 5.5 = 22.5 feet;
22.5 + 5.5 = 28 feet;
28 + 5.5 = 33.5 feet;
33.5 + 5.5 = 39 feet.
...

We skipped 35 feet.

Answer: C.

Or: options A, B, D and E are in A.P. 17, 28, 39, 50 (common difference 11). 35 clearly doesn't belong to this pattern.
Show more

Hi Bunuel,

Could you explain how you got 0.5ft for the post.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,811
Own Kudos:
810,948
Given Kudos: 105,869
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,811
Kudos: 810,948
A straight fence is to be constructed from posts 6 inches wide and sep 12 Jul 2018, 05:34
Kudos
Add Kudos
Bookmarks
Bookmark this Post
menonrit
Bunuel
shyind
A straight fence is to be constructed from posts 6 inches wideand separated by lengths of chain 5 feet long. If a certain fence begins and ends with a post, which of the following could not be the length of the fence in feet? (12 inches = 1 foot)

A. 17
B. 28
C. 35
D. 39
E. 50

The fence begins and ends with a post: {post = 0.5 feet}{chains = 5 feet}{post = 0.5 feet}...{chains = 5 feet}{post = 0.5 feet}

The minimum length is with 2 posts = 0.5 + 5 + 0.5 = 6 feet. To increase the fence, each time we should add{post = 0.5 feet}{chains = 5 feet}, so 5.5 feet. Thus, the lengths could be:

6 feet;
6 + 5.5 = 11.5 feet;
11.5 + 5.5 = 17 feet;
17 + 5.5 = 22.5 feet;
22.5 + 5.5 = 28 feet;
28 + 5.5 = 33.5 feet;
33.5 + 5.5 = 39 feet.
...

We skipped 35 feet.

Answer: C.

Or: options A, B, D and E are in A.P. 17, 28, 39, 50 (common difference 11). 35 clearly doesn't belong to this pattern.

Hi Bunuel,

Could you explain how you got 0.5ft for the post.
Show more

Check the highlighted parts in the stem.
avatar
Valhalla
avatar
Joined: 26 Apr 2017
Last visit: 29 Nov 2022
Posts: 38
Own Kudos:
146
Given Kudos: 71
Posts: 38
Kudos: 146
A straight fence is to be constructed from posts 6 inches wide and sep 12 Jul 2018, 05:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Let
n = number of 1 post + 1 chain
Therefore,
n(5.5)+0.5 = possible answer

After possible answer - 0.5, see whether it is divisibl e by 5.5.
Shift decimal 1place to right, so that it can be test whether possible answer is divisible by 5 (ending in 5) AND 11(center value = sum of 1st and last digit)

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,971
Own Kudos:
1,117
Posts: 38,971
Kudos: 1,117
A straight fence is to be constructed from posts 6 inches wide and sep 10 Nov 2023, 01:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109811 posts
Krunaal
Tuck School Moderator
853 posts