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# If right circular cylinders A and B have the same radius : height rati

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Retired Moderator
Joined: 26 Nov 2012
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If right circular cylinders A and B have the same radius : height rati  [#permalink]

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26 Apr 2017, 22:52
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100% (02:00) correct 0% (00:00) wrong based on 4 sessions

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If right circular cylinders A and B have the same radius : height ratio, what is the ratio of the curved surface area of cylinder A to the curved surface area of cylinder B?

(1) The ratio of the radius of cylinder A to the radius of cylinder B is 2:1
(2) The ratio of the volume of cylinder A to the volume of cylinder B is 8:1

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Re: If right circular cylinders A and B have the same radius : height rati  [#permalink]

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26 Apr 2017, 23:09
Given: Ra/Ha = Rb/Hb
CSA(a)/CSA(b) = ?
(Ra*Ha)/(Rb*Hb) = (Ra^2)/(Rb^2) = ?

St1: Ra/Rb = 2/1
Sufficient

St2: (Ra^3)/(Rb^3) = 8/1 --> Ra/Rb = 2/1
Sufficient

--== 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: If right circular cylinders A and B have the same radius : height rati &nbs [#permalink] 26 Apr 2017, 23:09
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