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GMAT Study Guide [#permalink] New post 16 Oct 2008, 15:06
Hi,
I am working on the Gmat Study Guide (wikibook of gmatclub) on the Algebra section. I have a question regarding Basic Rules for Inequalities:
Example: a>b>0, c>d>0
The guide says that "you can only apply substractions and divisions when their signs are in the opposite directions:
* a>b, d<c
* a-d>b-c
* a/d>b/c
* You cannot say a/c>b/c. It is WRONG.

My questions are:
1. when it says "their signs", which is it referring to? Is it a and b, d and c or what?
2. Why cannot you say a/c>b>c while you assume at the beginning at a>b>0 and c>d>0.

Can someone explain to me, please?
Thanks
Natalie
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Re: GMAT Study Guide [#permalink] New post 16 Oct 2008, 16:08
Thanks for the answer. and sorry for the typo.

the question is why it is wrong to say a/c>b/c while a>b>0 and c>d>0?
thanks
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Re: GMAT Study Guide [#permalink] New post 16 Oct 2008, 16:14
[quote="nganle08"]Thanks for the answer. and sorry for the typo.

the question is why it is wrong to say a/c>b/c while a>b>0 and c>d>0?

what has d got to do with it ??/

if a,b,c are +ve and a>b>0 and c>0

then sure

a/c>b/c
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Re: GMAT Study Guide [#permalink] New post 17 Oct 2008, 09:02
yezz wrote:
nganle08 wrote:
Thanks for the answer. and sorry for the typo.

the question is why it is wrong to say a/c>b/c while a>b>0 and c>d>0?

what has d got to do with it ??/

if a,b,c are +ve and a>b>0 and c>0

then sure

a/c>b/c



Thanks for the explanation. That's why I thought too. I do not know why it said "it is wrong" in the Study Guide. When you have time, you can check out the Gmat Study Guide to see if it is accurate the way I read it.
Thanks a lot
Re: GMAT Study Guide   [#permalink] 17 Oct 2008, 09:02
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