GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Aug 2018, 21:12

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# If the number of square units in the surface area of a

Author Message
Current Student
Joined: 11 May 2008
Posts: 551
If the number of square units in the surface area of a  [#permalink]

### Show Tags

11 Sep 2008, 21:27
If the number of square units in the surface area of a cylinder with a radius of 6 is 1/2 of the number of cubic units in the cylinder, what is the number of square units in the surface area?

A. 128pi
B. 192pi
C. 216pi
D. 324pi
E. 432pi

--== 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.
SVP
Joined: 29 Aug 2007
Posts: 2419

### Show Tags

11 Sep 2008, 21:49
arjtryarjtry wrote:
If the number of square units in the surface area of a cylinder with a radius of 6 is 1/2 of the number of cubic units in the cylinder, what is the number of square units in the surface area?

A. 128pi
B. 192pi
C. 216pi
D. 324pi
E. 432pi

$$1/2 (pi r^2 h)$$ = $$2 pi r h + 2 pi r^2)$$
$$(pi r^2 h)$$ = $$2x2 pi r (h + r)$$
$$(r h)$$ = $$4 (h + r)$$
rh = 4 (h + r)
6h = 4 (h + 6)
6h - 4h = 24
h = 12

surface area = 2 pi r (h + r) = 2 pi 6 (12+6) = 216 pi

//C//

--== 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.

_________________

Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Re: SURFACE AREA &nbs [#permalink] 11 Sep 2008, 21:49
Display posts from previous: Sort by

# If the number of square units in the surface area of a

Moderator: chetan2u

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.