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For integers a, b, and c, a/b-c =1 , What is the value of

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For integers a, b, and c, a/b-c =1 , What is the value of [#permalink]

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New post 10 Jul 2009, 13:36
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For integers a, b, and c, a/b-c =1 , What is the value of b-c/b ?
(1) a/b=3/5
(2) a and b have no common factors greater than 1.
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Re: fraction [#permalink]

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New post 10 Jul 2009, 13:47
A.
1) Given, a = b-c, Find b-c/b
b-c/b = a/b = 3/5

suff

2) we need to find b-c/b = a/b. Now a and b have no common factors greater than 1. So they are co-prime. We cant say anything about a/b because we don't know which co-primes are a and b.

insuff

Last edited by Economist on 15 Jul 2009, 23:34, edited 1 time in total.

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Re: fraction [#permalink]

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New post 10 Jul 2009, 13:50
In fact, your tagline should sound more positive...
"Everything is easy if you try hard"

Just a suggestion :)
vannu wrote:
For integers a, b, and c, a/b-c =1 , What is the value of b-c/b ?
(1) a/b=3/5
(2) a and b have no common factors greater than 1.

Kudos [?]: 842 [0], given: 18

Manager
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Kudos [?]: 101 [0], given: 10

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Re: fraction [#permalink]

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New post 10 Jul 2009, 16:45
Thanks for the suggestion. I like the punchline as it is.
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Re: fraction [#permalink]

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New post 11 Jul 2009, 15:12
Economist wrote:

2) we need to find b-c/b = a/b. Now a and b have no common factors greater than 1. So they are prime. We cant say anything about a/b because we don't know which primes are a and b.


small correction

a and b are not necessarily prime, they are co-prime.

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Re: fraction [#permalink]

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New post 11 Jul 2009, 16:05
wat is co-prime..product of primes?

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Re: fraction [#permalink]

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New post 11 Jul 2009, 16:10
Economist wrote:
wat is co-prime..product of primes?


co-prime integers are those that do not have any common factor other than 1.

like 35 and 26

neither of them are prime, yet they don't have any common factors other than 1.

24 and 12 are not co-prime. hope its clear. :)

Kudos [?]: 154 [0], given: 15

Manager
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Re: fraction [#permalink]

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New post 15 Jul 2009, 18:59
Thanks for the replies..
Thanks rashminet84 for your prompt replies..You ROCKKKK...
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Re: fraction [#permalink]

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New post 15 Jul 2009, 19:52
vannu wrote:
Thanks for the replies..
Thanks rashminet84 for your prompt replies..You ROCKKKK...

hey thanks :-D

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Re: fraction [#permalink]

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New post 15 Jul 2009, 23:35
rashminet84 wrote:
co-prime integers are those that do not have any common factor other than 1.

like 35 and 26

neither of them are prime, yet they don't have any common factors other than 1.

24 and 12 are not co-prime. hope its clear. :)

hmmm..thanks..i corrected my post as per the terminology...BTW I dont think GMAT uses this term..but its definitely good to know if it comes up surprisingly :)

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Re: fraction [#permalink]

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New post 16 Jul 2009, 06:18
Economist wrote:
rashminet84 wrote:
co-prime integers are those that do not have any common factor other than 1.

like 35 and 26

neither of them are prime, yet they don't have any common factors other than 1.

24 and 12 are not co-prime. hope its clear. :)

hmmm..thanks..i corrected my post as per the terminology...BTW I dont think GMAT uses this term..but its definitely good to know if it comes up surprisingly :)


You won't see the term 'co-prime' on the GMAT, and you won't see the equally common synonym 'relatively prime' either. If the GMAT does want to ask a question about relatively prime integers, the question will instead tell you that their Greatest Common Divisor is equal to 1.
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Kudos [?]: 1951 [0], given: 6

Re: fraction   [#permalink] 16 Jul 2009, 06:18
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For integers a, b, and c, a/b-c =1 , What is the value of

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