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Intern
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If a, b, c, and d are positive integers, is (a/b) (c/d) > [#permalink]
 16 Oct 2006, 18:31
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If a, b, c, and d are positive integers, is (a/b) (c/d) > c/b?
(1) c > b
(2) a > d
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Director
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A alone not sufficient
B alone not sufficient
C both are sufficient to answer.
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Director
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I think B...
The question asks whether (a/b)*(c/d)>c/b or....divide by a/b
c/d>(c/b)*(b/a)
c/d>c/a
1/d>1/a... that is the question.....
from 2) a>d, means that the answer to the question is YES....
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SVP
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(B) as well 
(a/b) (c/d) > c/b ?
<=> a/d * c/d > c/d ?
=> a/d > 1 ? as a, b, c and d are postive integers
<=> a > d ?
Stat1 : Brings nothing
Stat2 : Exactly what we need
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Director
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B
Question: Is a/d > 1 ?
Statement 1: INSUFF
Statement 2: SUFF
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Director
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Same explanantion as anand gave above. The answer is B
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