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

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Manager
Joined: 16 Apr 2009
Posts: 219
Schools: Ross
For integers a, b, and c, a/b-c =1 , What is the value of [#permalink]

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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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Director
Joined: 01 Apr 2008
Posts: 848
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

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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.
Director
Joined: 01 Apr 2008
Posts: 848
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

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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.
Manager
Joined: 16 Apr 2009
Posts: 219
Schools: Ross

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10 Jul 2009, 16:45
Thanks for the suggestion. I like the punchline as it is.
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Senior Manager
Joined: 04 Jun 2008
Posts: 286

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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.
Director
Joined: 01 Apr 2008
Posts: 848
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

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11 Jul 2009, 16:05
wat is co-prime..product of primes?
Senior Manager
Joined: 04 Jun 2008
Posts: 286

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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.
Manager
Joined: 16 Apr 2009
Posts: 219
Schools: Ross

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15 Jul 2009, 18:59
Thanks for the replies..
Thanks rashminet84 for your prompt replies..You ROCKKKK...
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Keep trying no matter how hard it seems, it will get easier.

Senior Manager
Joined: 04 Jun 2008
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15 Jul 2009, 19:52
vannu wrote:
Thanks for the replies..
Thanks rashminet84 for your prompt replies..You ROCKKKK...

hey thanks
Director
Joined: 01 Apr 2008
Posts: 848
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014

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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
GMAT Tutor
Joined: 24 Jun 2008
Posts: 1346

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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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Re: fraction   [#permalink] 16 Jul 2009, 06:18
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