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A fence consists of m lengths of fence that are each n feet

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A fence consists of m lengths of fence that are each n feet [#permalink] New post 09 Dec 2012, 10:53
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A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn
[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Dec 2012, 23:36, edited 1 time in total.
Renamed the topic, edited the question and moved to PS forum.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 09 Dec 2012, 23:44
Expert's post
akshayb2 wrote:
A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn


Notice that since a fence post separates each length of fence, then there will be m+1 posts, for example if there are m=2 fences, then there will be 3 posts: PFPFP. Thus the total length of the posts is (m+1)x.

The total length of the fence is mn, therefore the total length of the fence including the fence posts on each end is (m+1)x+mn=mx+x+mn=m(n+x)+x.

Answer: C.

Hope it's clear.

P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Please pay attention to the rules #2 and 3. Thank you.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 10 Dec 2012, 04:59
Hey Bunuel, thanks for the quick reply. I was bit confused with the wordings. Its clear now
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 11 Dec 2012, 11:37
Bunnuel I don't agree with you.
For me if there are n = 2 fences, then according to the requirement of there being a post to seperate them, there ought to be n-1 post. So mn + (n-1)x
But if the fence got to start and finish with a post, then yes you are right. But this is not what the stem says. I am getting things wrong? Please help.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 12 Dec 2012, 01:30
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Ousmane wrote:
Bunnuel I don't agree with you.
For me if there are n = 2 fences, then according to the requirement of there being a post to seperate them, there ought to be n-1 post. So mn + (n-1)x
But if the fence got to start and finish with a post, then yes you are right. But this is not what the stem says. I am getting things wrong? Please help.
Brother Karamazov


I think, this is exactly what the stem is saying:
"A fence post separates each length of fence..."
"What is the total length of the fence including the fence posts on each end".
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 12 Dec 2012, 05:58
Bunnuel, you are so kind. You should at times go angry. But don't mind me. I struggle with English some times
Thanks anyway
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 14 Dec 2012, 01:55
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Bunuel wrote:
akshayb2 wrote:
A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn


Notice that since a fence post separates each length of fence, then there will be n+1 posts, for example if there are n=2 fences, then there will be 3 posts: PFPFP. Thus the total length of the posts is (n+1)x.

The total length of the fence is mn, therefore the total length of the fence including the fence posts on each end is (n+1)x+mn=nx+x+mn=m(n+x)+x.

Answer: C.

Hope it's clear.

Hi, could you please recheck the highlighted portion. I think there is a mistake.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 14 Dec 2012, 02:02
Expert's post
mtripathy wrote:
Bunuel wrote:
akshayb2 wrote:
A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn


Notice that since a fence post separates each length of fence, then there will be n+1 posts, for example if there are n=2 fences, then there will be 3 posts: PFPFP. Thus the total length of the posts is (n+1)x.

The total length of the fence is mn, therefore the total length of the fence including the fence posts on each end is (n+1)x+mn=nx+x+mn=m(n+x)+x.

Answer: C.

Hope it's clear.

Hi, could you please recheck the highlighted portion. I think there is a mistake.


There was a typo: n instead of m (a-fence-consists-of-m-lengths-of-fence-that-are-each-n-feet-143845.html#p1152801) Thus it should be (m+1)x+mn=mx+x+mn=m(n+x)+x. Thank you for pointing that out. +1.
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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

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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 14 Dec 2012, 02:17
Ans:

the total length of fence without the posts would be mn, now if there are 2 fences there would be 3 posts because PFPFP, so total posts= (n+1). Length of posts=(n+1)x. Total length of fence= nx+x+mn, therefore the answer is (C).
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 16 Dec 2012, 23:15
Firstly the term just "fence" is not clear. Now a "fence" can be a closed fence or it can be an open fence. If this kind of wording was given then it would have been more clear because..

Things we know for sure
1. A "post" separates the "fence lengths"
2. m = #of fence lengths, 1lenght = n feet long, total length of the fence alone = mn
3. z = # of posts, length of 1 post = x feet long, total length of all the posts alone = zx
4. Total length of fence and posts = mn + zx

The crucial factor here is z. we have to determine what z is.

Now i stress more on the wording here in the question is because
1. Closed fence (the ends are joined)
When a fence is closed then the #of posts = #of fence lengths. Diagram it, it looks something like PFPF
m = z . Therefore Total = mn + mx

2. Open Fence (the ends are not joined)
What if the Fence starts wit a post
Case 1 - PFPFP here x = m + 1. Total length = mn + x(m + 1)
Case 2 - PFPFPF here x = m, Total Length = mn + mx

What if The fence starts with a Fence length
Case 1 - FPFPF here x = m -1, Total length = mn + (m-1)x
Case 2 - FPFP here x = m, Total Lenght = mn + mx

We have here three different kinds of answers and all of them are correct. The question is not specific.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 09 Feb 2014, 01:22
Bunuel wrote:
akshayb2 wrote:
A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn


Notice that since a fence post separates each length of fence, then there will be m+1 posts, for example if there are m=2 fences, then there will be 3 posts: PFPFP. Thus the total length of the posts is (m+1)x.

The total length of the fence is mn, therefore the total length of the fence including the fence posts on each end is (m+1)x+mn=mx+x+mn=m(n+x)+x.

Answer: C.

Hope it's clear.

P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Please pay attention to the rules #2 and 3. Thank you.

Hi Bunnel

Can you make a pictorial representation of your explanation? I'm not able to get it.
Apologies for the pain.
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Re: A fence consists of m lengths of fence that are each n feet [#permalink] New post 09 Feb 2014, 01:40
Expert's post
Qoofi wrote:
Bunuel wrote:
akshayb2 wrote:
A fence consists of m lengths of fence that are each n feet long. A fence post separates each length of fence by its width of x feet. What is the total length of the fence including the fence posts on each end?

A. mn
B. m(n + x)
C. m(n + x) + x
D. m(n + x) + 2x
E. 2mn


Notice that since a fence post separates each length of fence, then there will be m+1 posts, for example if there are m=2 fences, then there will be 3 posts: PFPFP. Thus the total length of the posts is (m+1)x.

The total length of the fence is mn, therefore the total length of the fence including the fence posts on each end is (m+1)x+mn=mx+x+mn=m(n+x)+x.

Answer: C.

Hope it's clear.

P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Please pay attention to the rules #2 and 3. Thank you.

Hi Bunnel

Can you make a pictorial representation of your explanation? I'm not able to get it.
Apologies for the pain.


It's already given. If m=2 fences there will be 3 posts: {Post}{Fence}{Post}{Fence}{Post}. Each fence is n feet and each post is x feet.
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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.


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Re: A fence consists of m lengths of fence that are each n feet   [#permalink] 09 Feb 2014, 01:40
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