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Susan marks-off a 2-meter cloth into multiples of three and five. She

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Joined: 31 Oct 2018
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Susan marks-off a 2-meter cloth into multiples of three and five. She  [#permalink]

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New post 18 Apr 2019, 10:00
1
5
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

39% (02:41) correct 61% (02:24) wrong based on 57 sessions

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Susan marks-off a 2-meter cloth into multiples of three and five. She then breaks the cloth along all the markings and removes one piece of every distinct length. What fraction of the original cloth remains?

A. 2/5
B. 7/15
C. 1/2
D. 8/15
E. 3/5
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Joined: 02 Aug 2009
Posts: 8320
Re: Susan marks-off a 2-meter cloth into multiples of three and five. She  [#permalink]

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New post 18 Apr 2019, 20:14
btrg wrote:
Susan marks-off a 2-meter cloth into multiples of three and five. She then breaks the cloth along all the markings and removes one piece of every distinct length. What fraction of the original cloth remains?

A. 2/5
B. 7/15
C. 1/2
D. 8/15
E. 3/5


Of course, the question is wrongly worded. How can we cut a 2 units thing into MULTIPLES of 3 and 5.
So, it is meant to be cut into thirds and fifths..

So basically we are cutting at 1/3 and 1/5 of 2..
Different locations of cut...
0, 2/5, 2/3, 4/5, 6/5, 4/3, 8/5, 1...
Distinct lengths...(2/5-0 or 2/5), (2/3-2/5 or 4/15), (4/5-2/3 or 2/15).. Rest all will again be 2/5, 2/15, 4/15

Sum of these lengths = 2/5+4/15+2/15=4/5...
Left is 2-4/5=6/5...
6/5 as a fraction of 2 is (6/5)/2=6/(5*2)=3/5..

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Re: Susan marks-off a 2-meter cloth into multiples of three and five. She  [#permalink]

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New post 26 Apr 2019, 23:13
hi, can anyone offer an explanation for the answer?
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Re: Susan marks-off a 2-meter cloth into multiples of three and five. She  [#permalink]

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New post 26 Apr 2019, 23:23
abhishek31 wrote:
hi, can anyone offer an explanation for the answer?


Hey abhishek31, sorry to say this but there is no official explanation for this question. Please refer to prev post by chetan2u
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Re: Susan marks-off a 2-meter cloth into multiples of three and five. She  [#permalink]

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New post 27 Apr 2019, 21:22
The actual length is irrelevant, so pretend length = 1 for simplicity, and draw a line segment from 0-1.

Mark a tick at all the appropriate spots (1/3, 2/3) and (1/5, 2/5, 3/5, 4/5). You should see there are 3 distinct lengths that are formed by these cuts:

A = 1/5
B = 1/3 - 1/5 = 2/15
C = 2/5 - 1/3 = 1/15

*be careful and note that the middle section is simply a type A length (1/5).

Take the sum of A,B,C and subtract it from 1 (i.e. 100%) to get the answer.

Conversely, it is probably easier to just see it on the number line with A,B,C segments being next to each other and terminating at 2/5. (1-2/5 = 3/5)
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Re: Susan marks-off a 2-meter cloth into multiples of three and five. She   [#permalink] 27 Apr 2019, 21:22
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