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# is (a/d)(b/e)(c/f) > (b/d) (c/e) ? 1) bc > de 2) a

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Senior Manager
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is (a/d)(b/e)(c/f) > (b/d) (c/e) ? 1) bc > de 2) a [#permalink]  29 Apr 2006, 12:03
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is (a/d)(b/e)(c/f) > (b/d) (c/e) ?

1) bc > de

2) a > f
Senior Manager
Joined: 05 Jan 2006
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I would chose E

because none of this gives us clear indication about sign of any numbers, I would not even spend time plugging numbers...!

bc>de bc=-1 or 1 and de=-11... it just tells that |bc/de|>1

so does 2 which says |a/f|>1
Manager
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Question - Is abc/def >bc/de?

= abc/def - bc/de >0
=bc/de (a/f -1)>0

From A we know only bc>de - insuff
From B we know only a>f - insuff

But together, if product of two terms is greater than 0 then the LHS> RHS. Answer is C.
SVP
Joined: 01 May 2006
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I'm agree on (E)

We have no idea about the sign of a,b,... So any division or multipication done on inequalities will have no meaning.
GMAT Club Legend
Joined: 07 Jul 2004
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(a/d)(b/e)(c/f) > (b/d)(c/e)
abc/def > bc/de
a/f > 1 <-- The question is asking if a/f is a positive number.

St1:
Insufficient. Does not tells us anything about a or f.

St2:
Insufficient. Could be 'a' positive, 'f' negative and a/f < 1 or 'a' positive and 'f' positive, then a/f > 1.

Using both St1 and St2:

Nothing extra is provided as St1 is quite redundant.

Ans E
VP
Joined: 29 Apr 2003
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Loner wrote:
Question - Is abc/def >bc/de?

= abc/def - bc/de >0
=bc/de (a/f -1)>0

From A we know only bc>de - insuff
From B we know only a>f - insuff

But together, if product of two terms is greater than 0 then the LHS> RHS. Answer is C.

How did you get LHS>RHS?

I get E also.. whats the source of the problem?
Intern
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so from the question stem it is really asking is a/f>1 is it not equivalent to saying a>f ? If yes, then shouldn't B suffice? Can someone please explain.

Thanks
VP
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minu wrote:
so from the question stem it is really asking is a/f>1 is it not equivalent to saying a>f ? If yes, then shouldn't B suffice? Can someone please explain.

Thanks

a/f>1 IS equivalent to a>f (if f is +ve)
Manager
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So, it is E because from 2) we don't know the sign of a and f?

So as I understand if for example it was given that a,f are positive then the answer would have have been B, since a/f > 1. thanks
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