A straight pipe 1 yard in length was marked off in fourths : GMAT Problem Solving (PS)
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# A straight pipe 1 yard in length was marked off in fourths

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A straight pipe 1 yard in length was marked off in fourths [#permalink]

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31 Dec 2012, 04:21
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A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3
[Reveal] Spoiler: OA
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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31 Dec 2012, 04:30
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A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Since we want to find the fractions, we can assume some other length of the pipe which will make calculation easier. Take the length of the pipe to be 12-meter long (the least common multiple of 3 and 4.

In this case the branch would be cut at 3, 4, 6, 8, and 9 meters (in black are given fourths of the length and in red thirds of the length).

Distinct lengths would be: 3=3/12=1/4, 4-3=1=1/12 and 6-4=2=2/12=1/6 meters long pieces.

Similar question to practice:
on-the-number-line-above-the-segment-from-0-to-1-has-been-104204.html
kim-finds-a-1-meter-tree-branch-and-marks-it-off-in-thirds-140038.html
if-the-successive-tick-marks-shown-on-the-number-line-above-144053.html

Hope it helps.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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31 Dec 2012, 06:21
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A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Generally fast way to solve such problem is writing the different marks in ascending/descending order with same denominator:

Here 4th : 0/4, 1/4, 2/4, 3/4, 4/4
and 3rd : 0/3, 1/3, 2/3, 3/3

Now with understood common denominator 12 write the numbers : for 4th : 0,3,6,9,12 and for 3rd : 0,4,8,12

Now comine : 0,3,4,6,8,9,12

Now find the cut with denominator 12 (Substracrt adjacent terms : 3/12, 1/12, 2/12, 1/12,3/12 i.e. 1/4, 1/12 and 1/6 after removing duplicates.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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11 May 2014, 00:58
Bunuel wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Since we want to find the fractions, we can assume some other length of the pipe which will make calculation easier. Take the length of the pipe to be 12-meter long (the least common multiple of 3 and 4.

In this case the branch would be cut at 3, 4, 6, 8, and 9 meters (in black are given fourths of the length and in red thirds of the length).

Distinct lengths would be: 3=3/12=1/4, 4-3=1=1/12 and 6-4=2=2/12=1/6 meters long pieces.

Hope it helps.

Hi,

Request you could explain the answer in more detail? I did not understand how the branch would be cut at 3,4,6,8,9.

since there are two markings, there would be three distinct pieces of the branch right? 1/4th part, 1/12th part [1/3 - 1/4] and i cannot understand about how the third part is 1/6th?
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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11 May 2014, 04:44
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harishbiyani wrote:
Bunuel wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Since we want to find the fractions, we can assume some other length of the pipe which will make calculation easier. Take the length of the pipe to be 12-meter long (the least common multiple of 3 and 4.

In this case the branch would be cut at 3, 4, 6, 8, and 9 meters (in black are given fourths of the length and in red thirds of the length).

Distinct lengths would be: 3=3/12=1/4, 4-3=1=1/12 and 6-4=2=2/12=1/6 meters long pieces.

Hope it helps.

Hi,

Request you could explain the answer in more detail? I did not understand how the branch would be cut at 3,4,6,8,9.

since there are two markings, there would be three distinct pieces of the branch right? 1/4th part, 1/12th part [1/3 - 1/4] and i cannot understand about how the third part is 1/6th?

Imagine that we have 12-meter long pipe.

Cut in fourths means that it's cut at 1/4th, at 2/4th and at 3/4th. Thus at 3, 6, and 9 meters.
Cut in thirds means that it's cut at 1/3rd, and at 2/3rd Thus at 4 and 8 meters.

So, it would be cut at 3, 4, 6, 8, and 9 meters.

Does this make sense?

In my post above there are similar questions to practice. Please go through them.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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25 May 2014, 02:02
Bunuel wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Since we want to find the fractions, we can assume some other length of the pipe which will make calculation easier. Take the length of the pipe to be 12-meter long (the least common multiple of 3 and 4.

In this case the branch would be cut at 3, 4, 6, 8, and 9 meters (in black are given fourths of the length and in red thirds of the length).

Distinct lengths would be: 3=3/12=1/4, 4-3=1=1/12 and 6-4=2=2/12=1/6 meters long pieces.

Similar question to practice:
on-the-number-line-above-the-segment-from-0-to-1-has-been-104204.html
kim-finds-a-1-meter-tree-branch-and-marks-it-off-in-thirds-140038.html
if-the-successive-tick-marks-shown-on-the-number-line-above-144053.html

Hope it helps.

I didn't understand the part in red...
Why are subtracting 3 from 4 and so on...
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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25 May 2014, 02:20
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b2bt wrote:
Bunuel wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Since we want to find the fractions, we can assume some other length of the pipe which will make calculation easier. Take the length of the pipe to be 12-meter long (the least common multiple of 3 and 4.

In this case the branch would be cut at 3, 4, 6, 8, and 9 meters (in black are given fourths of the length and in red thirds of the length).

Distinct lengths would be: 3=3/12=1/4, 4-3=1=1/12 and 6-4=2=2/12=1/6 meters long pieces.

Similar question to practice:
on-the-number-line-above-the-segment-from-0-to-1-has-been-104204.html
kim-finds-a-1-meter-tree-branch-and-marks-it-off-in-thirds-140038.html
if-the-successive-tick-marks-shown-on-the-number-line-above-144053.html

Hope it helps.

I didn't understand the part in red...
Why are subtracting 3 from 4 and so on...

Have you checked this: a-straight-pipe-1-yard-in-length-was-marked-off-in-fourths-145031.html#p1363396 and similar questions given there?
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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25 May 2014, 04:06
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Quote:
Have you checked this: a-straight-pipe-1-yard-in-length-was-marked-off-in-fourths-145031.html#p1363396 and similar questions given there?

Thanks Bunuel ! I understood after solving similar sum and by drawing it out!

____________.____._______.________.___.______________
____________|____|_______|_______|____|_____________
____1___2___3___4___5___6___7___8___9___10___11___12

First section is 3/12 = 1/4
Second section is 1/12
Third section is 2/12 = 1/6 and so on..
We will have three unique values..

Last edited by b2bt on 03 Jun 2014, 18:31, edited 1 time in total.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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25 May 2014, 16:38
maibhihun wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Generally fast way to solve such problem is writing the different marks in ascending/descending order with same denominator:

Here 4th : 0/4, 1/4, 2/4, 3/4, 4/4
and 3rd : 0/3, 1/3, 2/3, 3/3

Now with understood common denominator 12 write the numbers : for 4th : 0,3,6,9,12 and for 3rd : 0,4,8,12

Now comine : 0,3,4,6,8,9,12

Now find the cut with denominator 12 (Substracrt adjacent terms : 3/12, 1/12, 2/12, 1/12,3/12 i.e. 1/4, 1/12 and 1/6 after removing duplicates.

Now with understood common denominator 12 write the numbers : for 4th : 0,3,6,9,12 and for 3rd : 0,4,8,12 ( Where is 0,3,6,9,12) and 0,4,8,12 coming from for four and 3 it seems like it should be reverse to me, obviously i am mistaken, but why is this done like this?
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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25 May 2014, 22:50
sagnik2422 wrote:
maibhihun wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

Generally fast way to solve such problem is writing the different marks in ascending/descending order with same denominator:

Here 4th : 0/4, 1/4, 2/4, 3/4, 4/4
and 3rd : 0/3, 1/3, 2/3, 3/3

Now with understood common denominator 12 write the numbers : for 4th : 0,3,6,9,12 and for 3rd : 0,4,8,12

Now comine : 0,3,4,6,8,9,12

Now find the cut with denominator 12 (Substracrt adjacent terms : 3/12, 1/12, 2/12, 1/12,3/12 i.e. 1/4, 1/12 and 1/6 after removing duplicates.

Now with understood common denominator 12 write the numbers : for 4th : 0,3,6,9,12 and for 3rd : 0,4,8,12 ( Where is 0,3,6,9,12) and 0,4,8,12 coming from for four and 3 it seems like it should be reverse to me, obviously i am mistaken, but why is this done like this?

Imagine that we have 12-meter long pipe.

Cut in fourths means that it's cut at 1/4th, at 2/4th and at 3/4th. Thus at 3, 6, and 9 meters.
Cut in thirds means that it's cut at 1/3rd, and at 2/3rd Thus at 4 and 8 meters.

So, it would be cut at 3, 4, 6, 8, and 9 meters.

Does this make sense?

In my post above there are similar questions to practice. Please go through them.
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A straight pipe 1 yard in length was marked off in fourths [#permalink]

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20 Jan 2015, 11:53
I don't think you need to calculate anything here, unless I found the correct answer in random. This was the process I followed:

1) I drew a straight line for the pipe.
2) I marked the 1/4ths. This means I marked it in 3 places, as you will see in the drawing below (|).
3) I marked the 1/3rds. This means I marked it in 2 places, as you will see in the drawing below (!).

|_______|__!_____|__!_____|_______|

So, now we see the thirds and the fourths. What you see it that the "whole" pieces you see are of 3 different lenghts.
The 1/4 is seen in the begining and the end.
There is no whole 1/3 anywhere. But, there are 2 other lengths dividing the fourths: a smaller one and a larger one, marked by the !.

In other words, we need 3 different lengths:
One will be the 1/4
None will be 1/3
There will be 2 other lengths.

Only D satisfies this observation, so ANS D.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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20 Jan 2015, 19:27
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Refer diagram below:

Attachment:

length.png [ 2.53 KiB | Viewed 11431 times ]

LCM of 3 & 4 = 12, marking the lengths accordingly

Lengths possible are $$\frac{3}{12}, \frac{1}{12}, \frac{2}{12} = \frac{1}{4}, \frac{1}{12}, \frac{1}{6}$$

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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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30 Sep 2015, 12:39
PareshGmat wrote:
Refer diagram below:

Attachment:
length.png

LCM of 3 & 4 = 12, marking the lengths accordingly

Lengths possible are $$\frac{3}{12}, \frac{1}{12}, \frac{2}{12} = \frac{1}{4}, \frac{1}{12}, \frac{1}{6}$$

where is 1/12 coming from?
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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24 Nov 2015, 02:07
sagnik242 wrote:
PareshGmat wrote:
Refer diagram below:

Attachment:
length.png

LCM of 3 & 4 = 12, marking the lengths accordingly

Lengths possible are $$\frac{3}{12}, \frac{1}{12}, \frac{2}{12} = \frac{1}{4}, \frac{1}{12}, \frac{1}{6}$$

where is 1/12 coming from?

that is 9/12 - 8/12. Great explanation Paresh. I am going with your way on this one.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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28 Apr 2016, 19:05
These are good to draw if you are visual like myself

().......|..........|............|.........)
roughly quartered up

().......|..........|............|.........)
...........^.................^..........
now the thirds

().......|..........|............|.........)
...........^.................^..........
you can see that there is a space between the first 1/4 & 1/3 and last 1/4 & 1/3 that are equal
you can also see that there is an equal amount of space between the first 1/3 and middle, and from the middle to the last 1/3

1/3 - 1/4 = 4/12-3/12 = 1/12 (we have two of these pieces)
1/2 - 1/3 = 3/6 - 2/6 = 1/6 (we have two of these pieces)
and the remaining two pieces are the quarter sections at the beginning and end
so we have 2 X 1/12, 2 X 1/6 and 2 X 1/4
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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29 Apr 2016, 08:35
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A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6 and 1/4
(E) 1/12, 1/6, and 1/3

This problem is best solved by setting up a diagram to represent the markings. We are given that we are marking the pipe into 3rds and 4ths. So we will have:

1/3, 2/3, 3/3, and ¼, 2/4, ¾, 4/4

However, for these “markings” to be more meaningful, we should create a common denominator. Because the denominators are 3 and 4, we know that the common denominator is 12. Converting each fraction, we have:

4/12, 8/12, 12/12 = 1, and 3/12, 6/12, 9/12, 12/12 = 1

Putting these in order we have:

3/12, 4/12, 6/12, 8/12, 9/12, 1

We now label this on a diagram:

We are then asked, if the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?

To determine this, we need to calculate the difference between each consecutive pair of markings. This is represented in another diagram below.

1) 3/12 – 0 = 3/12 = ¼

2) 4/12 – 3/12 = 1/12

3) 6/12 – 4/12 = 2/12 = 1/6

4) 8/12 – 6/12 = 2/12 = 1/6

5) 9/12 – 8/12 = 1/12

6) 1 – 9/12 = 3/12 = ¼

Thus, the different lengths are 1/12, 1/6, and ¼.

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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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24 May 2016, 00:38
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This problem is solved in under 30 secs: just draw a picture on paper as in the previous post. You right away understand that 1/3 will not survive - it is cut all and through. So eliminate 3 answer choices: B, C and E. Between A and D you know that 1/4 will always be there and there are more than 1 additional fragment - so you kick out A.
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Re: A straight pipe 1 yard in length was marked off in fourths [#permalink]

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24 May 2016, 04:32
This problem is solved in under 30 secs: just draw a picture on paper as in the previous post. You right away understand that 1/3 will not survive - it is cut all and through. So eliminate 3 answer choices: B, C and E. Between A and D you know that 1/4 will always be there and there are more than 1 additional fragment - so you kick out A.

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A straight pipe 1 yard in length was marked off in fourths and also i [#permalink]

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10 Jul 2016, 03:22
LogicGuru1 wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all of the different lengths of the pieces , in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6, and 1/4
(E) 1/12, 1/6, and 1/3

Note:- A very beautiful problem that can be solved either using, Fractions, Geometry or Number-line or plainly by experience.(If you cut a lot of pipes)

Given that there is straight pipe of 1 yard in length and was off in 1/4 and 1/3.

Then LCM will be 12.

If we take factors of 4 - 4,8,12, etc.

If we take factors of 3 - 3,6,9,12,etc.

Then write it in ascending order 3,4,6,8,9,12. Here 12 is LCM now we can take difference to get the factors.

4-3 /12 = 1/12
6-4 /12 = 1/6
9-6 / 12 = 1/4

IMO C is correct option.. OA please will correct if I missed anything...
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Re: A straight pipe 1 yard in length was marked off in fourths and also i [#permalink]

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10 Jul 2016, 03:43
LogicGuru1 wrote:
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all of the different lengths of the pieces , in fractions of a yard?

(A) 1/6 and 1/4 only
(B) 1/4 and 1/3 only
(C) 1/6, 1/4, and 1/3
(D) 1/12, 1/6, and 1/4
(E) 1/12, 1/6, and 1/3

Note:- A very beautiful problem that can be solved either using, Fractions, Geometry or Number-line or plainly by experience.(If you cut a lot of pipes)

May be i m not getting properly
But summing up all fractions should end in full length if pipe(1Yard)
Neither options on sum gives me that..

Thanks..
Re: A straight pipe 1 yard in length was marked off in fourths and also i   [#permalink] 10 Jul 2016, 03:43

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