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If a, b, c, and d are positive integers, is (a/b) (c/d) >

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If a, b, c, and d are positive integers, is (a/b) (c/d) > [#permalink] New post 28 Aug 2010, 02:04
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A
B
C
D
E

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60% (01:29) correct 40% (02:04) wrong based on 5 sessions
If a, b, c, and d are positive integers, is (a/b) (c/d) > c/b?
(1) c > b
(2) a > d
[Reveal] Spoiler: OA
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Re: Inequality [#permalink] New post 28 Aug 2010, 05:03
is (a/b) (c/d) > c/b ? simplify => a/d>1? => is a>d?

(2) a > d

"B" it is
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Re: Inequality [#permalink] New post 28 Aug 2010, 21:38
Got trapped...Good one Soumanag!!
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Re: Inequality [#permalink] New post 29 Aug 2010, 17:25
udaymathapati wrote:
If a, b, c, and d are positive integers, is (a/b) (c/d) > c/b?
(1) c > b
(2) a > d



\frac{a}{b}*\frac{c}{d}>\frac{c}{b}

simplify

\frac{a}{d}>1

a>d ?

therefore B is enough, A is irrelevant
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Re: Inequality [#permalink] New post 30 Aug 2010, 02:59
The key here is in the given ( a,b,c,d) are +ve if this wasn't stated then we can't multiply or simplify
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Re: Inequality [#permalink] New post 30 Aug 2010, 07:06
If a, b, c, and d are positive integers, is (a/b) (c/d) > c/b?
(1) c > b
(2) a > d

change the question it becomes a > d
so answer is b
Re: Inequality   [#permalink] 30 Aug 2010, 07:06
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