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23 Nov 2016, 06:41
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
78% (02:10) correct
22%
(02:33)
wrong
based on 169
sessions
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Let right cylinder C have height h and radius r. Let both h and r be >2. If C has equal volume and surface area, what is h expressed in terms of r?
A. h=r
B. h=−r
C. h=1/(r−2)
D. h=rπ/(r−2)
E. h=2r/(r−2)
A. h=r
B. h=−r
C. h=1/(r−2)
D. h=rπ/(r−2)
E. h=2r/(r−2)
Vinayak Shenoy
Joined: 06 Jun 2016
Last visit: 27 Jun 2017
Posts: 225
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Location: India
Concentration: Operations, Strategy
Schools: ISB '18 (D)
GMAT 1: 600 Q49 V23
GMAT 2: 680 Q49 V34
GPA: 3.9
Updated on: 15 Dec 2016, 02:53
Originally posted by Vinayak Shenoy on 23 Nov 2016, 07:14.
Last edited by Vinayak Shenoy on 15 Dec 2016, 02:53, edited 1 time in total.
Last edited by Vinayak Shenoy on 15 Dec 2016, 02:53, edited 1 time in total.
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Bunuel
IMO E
volume of a cylinder = pi*r*r*h
surface area= 2*pi*r*r+ 2*pi*r*h
Volume= surface area
pi*r*r*h= 2*pi*r(r+h)
solving we get h= 2r/(r-2)
koenh
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13 Dec 2016, 02:44
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Vinayak Shenoy
Could you expand on how you solve this last part?
