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If s > 0 and (r/s)^1/2=s, what what is r in terms of s ?

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If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink] New post 12 Dec 2012, 08:32
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If s > 0 and \sqrt{\frac{r}{s}}=s, what is r in terms of s ?

(A) 1/s
(B) \sqrt{s}
(C) s\sqrt{s}
(D) s^3
(E) s^2-s
[Reveal] Spoiler: OA
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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ? [#permalink] New post 12 Dec 2012, 08:33
Walkabout wrote:
If s > 0 and \sqrt{\frac{r}{s}}=s, what is r in terms of s ?

(A) 1/s
(B) \sqrt{s}
(C) s\sqrt{s}
(D) s^3
(E) s^2-s


\sqrt{\frac{r}{s}}=s --> \frac{r}{s}=s^2 --> r=s^3.

Answer: D.
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Re: If s > 0 and (r/s)^1/2=s, what what is r in terms of s ?   [#permalink] 12 Dec 2012, 08:33
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