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# Solve this root

Author Message
Manager
Joined: 25 May 2009
Posts: 140
Concentration: Finance
GMAT Date: 12-16-2011

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28 Jun 2009, 14:32
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Question Stats:

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$$2(\frac{2sqrt2}{\sqrt{pie}})$$

$$4\frac{2}{\sqrt{pie}}$$

Please explain, I keep getting $$\frac{4sqrt2}{sqrt(pie)}$$

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Senior Manager
Joined: 04 Jun 2008
Posts: 276

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28 Jun 2009, 14:46
are u sure this answer is correct? It should be the ans that you are getting
Manager
Joined: 25 May 2009
Posts: 140
Concentration: Finance
GMAT Date: 12-16-2011

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28 Jun 2009, 15:33
That's what I thought. Is the OG wrong? Please see the Diagnostic Test Question #22.
Manager
Joined: 28 Jan 2004
Posts: 198
Location: India

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28 Jun 2009, 22:42
The OG is right.There is a catch in this question.

Volume of cylinder = Pi * R *R *H
Cylinder is half filled with water,so volume of his much water = Pi * R *R * (h/2) = 36
Now if you calculate,

h *R^2 *Pi = 72
R^2 * Pi = 72/9
R^2 * Pi = 8
R^2 = 8/Pi
or R = Sqrt(8/Pi)
= 2Sqrt(2) / Sqrt(Pi)
So diameter = 4Sqrt(2) / Sqrt(Pi)
Manager
Joined: 28 Jan 2004
Posts: 198
Location: India

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28 Jun 2009, 22:45

The answer which you are getting = same as what i calculated = same as in OG (option E).
Manager
Joined: 25 May 2009
Posts: 140
Concentration: Finance
GMAT Date: 12-16-2011

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29 Jun 2009, 06:19
Wouldn't $$4sqrt2$$ be the same as $$sqrt16=4$$? Why is the answer for the numerator 4(2)?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Solve this root &nbs [#permalink] 29 Jun 2009, 06:19
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