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Re: If a,b,c and d are positive integers, is (a/b) (c/d) > [#permalink]

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02 Aug 2010, 00:34

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Stmt 2 is sufficient as follows:

LHS and RHS can be rearranged into (a/d)(c/b) > (c/b) As c and b are both positive (you don't need Stmt 1 for that), they can be cancelled out from both sides - which leaves us with a/d > 1 ??

Re: If a,b,c and d are positive integers, is (a/b) (c/d) > [#permalink]

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02 Aug 2010, 01:51

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\((\frac{a}{b})(\frac{c}{d})=(\frac{a}{d})(\frac{c}{b})>(\frac{c}{b})\) Since a, b, c, d are positive, so both sides can be divided by \((\frac{c}{b})\) \(\frac{(\frac{a}{d})(\frac{c}{b})}{(\frac{c}{b})}>\frac{(\frac{c}{b})}{(\frac{c}{b})}\) or \(\frac{a}{d}>1\) or a>d

Re: If a,b,c and d are positive integers, is (a/b) (c/d) > [#permalink]

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04 May 2016, 14:42

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If a,b,c and d are positive integers, is (a/b) (c/d) > [#permalink]

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18 Jul 2016, 00:53

jakolik wrote:

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

(1) c>b (2) a>d

Given that a,b,c,d, are all positives; so we can take a deep breath of relief and carry on with this question because now we can apply any operation on the inequality without worrying about the sign reversal and other such restrictions (1) c>b (2) a>d

Simplify the original equation and see what the question stem reduces to :- \(\frac{a}{b} * \frac{c}{d} >\frac{c}{b}\)

\(\frac{ac}{bd}>\frac{c}{d}\) {\(\frac{c}{b}\)will get cancelled on both the LHS & RHS}

\(\frac{a}{d}>1\)

\(a>d\)

SO THE REAL QUESTION IS :- IS \(a>d\)

(1) c>b Doesn't tell about a and b ; INSUFFICIENT

(2) a>d Tells us that a is always greater than d SUFFICIENT

ANSWER IS B
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