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If r > 0 and s > 0, is r/s < s/r?

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If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 17 Aug 2010, 08:02
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If r > 0 and s > 0, is r/s < s/r?

(1) r/(3s) = 1/4
(2) s = r + 4
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Re: GMAT - PAPER TEST QUESTION [#permalink] New post 17 Aug 2010, 08:21
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If r > 0 and S > 0, Is r/s < s/r?

Is \(\frac{r}{s}<\frac{s}{r}\)?

(1) \(\frac{r}{3s}=\frac{1}{4}\) --> \(\frac{r}{s}=\frac{3}{4}\), so \(\frac{s}{r}=\frac{4}{3}\) --> \(\frac{r}{s}=\frac{3}{4}<\frac{4}{3}=\frac{s}{r}\) thus answer to the question is YES. Sufficient.

(2) \(s=r+4\) --> so \(s>r\) as given that \(r>0\) --> \(s>r>0\) --> \(\frac{s}{r}>1>\frac{r}{s}\), thus answer to the question is YES. Sufficient.

Answer: D.
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Re: GMAT - PAPER TEST QUESTION [#permalink] New post 01 Nov 2010, 07:44
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cmugeria wrote:
If R > 0 and S > 0, Is r/s < s/r?

1) r/3s =1/4
2) s = r + 4


Since r and s are both positive, we can simplify the inequality to \(r^2 < s^2\), and by taking the square root of both sides, \(r < s\).

(1) \(4r = 3s\)
\(r = \frac{3}{4}s\)
So r < s. Sufficient.

(2) Since \(r = s - 4\), \(r < s\). Sufficient.
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Re: If R > 0 and S > 0, Is r/s < s/r? 1) r/3s =1/4 2) s [#permalink] New post 29 Nov 2011, 00:22
1. r/3s=1/4 so 3s = 4r , which is s>r - Sufficient
2. s=r+4 menas S>R - sufficient

Answer - D
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Re: If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 29 Jan 2013, 08:04
cmugeria wrote:
If r > 0 and s > 0, is r/s < s/r?

(1) r/(3s) = 1/4
(2) s = r + 4



For 1 --- \(\frac{r}{s}\)= 3/4we can deduce from this

From 2.... s = r+4

substituting this in the question---

\(\frac{r}{4+r}\)<\(\frac{4+r}{r}\)
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Re: If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 01 Sep 2013, 13:09
First I restated the problem since we are given r and s are greater than 0 --> therefore, the question can be solved by answering whether or not r^2<s^2.

(1) r = (3/4)s [r<s, so r^2 < s^2] Sufficient AD/BCE - elminate BCE
(3) s = r + 4 [r<s, so r^2 < s^2] Sufficent - elminate A ... answered D
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Re: If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 01 Oct 2014, 04:30
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Re: If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 14 Nov 2015, 03:55
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Re: If r > 0 and s > 0, is r/s < s/r? [#permalink] New post 17 Nov 2015, 09:29
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Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

If r > 0 and s > 0, is r/s < s/r?

(1) r/(3s) = 1/4
(2) s = r + 4

In inequalities, the sign does not change when a positive integer is multiplied on both sides.
If we modify the question, r/x<s/r, or is r^2<s^2, of is r^2-s^2<0?, or (r-s)(r+s)<0? and r>0 and s>0, so we want to know whether
r-s>0?
For condition 1, in r/s=3/4, r and s are positive, so s>r, which answers the question 'yes' and is sufficient.
For condition 2, s-r=4>0. s>r, so this also answers the question 'yes' and is sufficient.
The answer becomes (D).

Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
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Re: If r > 0 and s > 0, is r/s < s/r?   [#permalink] 17 Nov 2015, 09:29
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