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UtterNonsense
Joined: 25 Jul 2011
Last visit: 07 Aug 2012
Posts: 18
Given Kudos: 7
Location: United Kingdom
Concentration: Finance, Strategy
Schools: Schulich (A)
GMAT 1: 660 Q49 V31
GPA: 3.13
26 Jul 2011, 06:42
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (00:55) correct
19%
(01:06)
wrong
based on 80
sessions
History
Date
Time
Result
Not Attempted Yet
What is the surface area of the cube? (Regular cube)
(1) The magnitude of the volume of the cube is 10 times the magnitude of the surface area on one face of the cube
(2) The length of the diagonal of a face of the cube is 10Root(2) inches.
The official answer provided was D however I think that B should be the answer as the in the Unit is not provided hence we cannot tell what the surface area would be. Please comment.
(1) The magnitude of the volume of the cube is 10 times the magnitude of the surface area on one face of the cube
(2) The length of the diagonal of a face of the cube is 10Root(2) inches.
The official answer provided was D however I think that B should be the answer as the in the Unit is not provided hence we cannot tell what the surface area would be. Please comment.
26 Jul 2011, 08:27
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surface area of cube=6(side)^2
volume of cube=(side)^3
1) The magnitude of the volume of the cube is 10 times the magnitude of the surface area on one face of the cube
volume=10(side)^2
(side)^3=10(side)^2
therefore side of cube=10
therefore surface area=6*10^2=600
Therefore 1 is sufficient
2) The length of the diagonal of a face of the cube is 10Root(2) inches.
digonal of face of cube = digonal of square=(side)*root(2)
therefore side=10
therefore surface area=600
therefore b is sufficient
so answer is D(EACH statement ALONE is sufficient.)
volume of cube=(side)^3
1) The magnitude of the volume of the cube is 10 times the magnitude of the surface area on one face of the cube
volume=10(side)^2
(side)^3=10(side)^2
therefore side of cube=10
therefore surface area=6*10^2=600
Therefore 1 is sufficient
2) The length of the diagonal of a face of the cube is 10Root(2) inches.
digonal of face of cube = digonal of square=(side)*root(2)
therefore side=10
therefore surface area=600
therefore b is sufficient
so answer is D(EACH statement ALONE is sufficient.)
UtterNonsense
Joined: 25 Jul 2011
Last visit: 07 Aug 2012
Posts: 18
Own Kudos:
Given Kudos: 7
Location: United Kingdom
Concentration: Finance, Strategy
Schools: Schulich (A)
GMAT 1: 660 Q49 V31
GPA: 3.13
26 Jul 2011, 09:10
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mehtakaustubh
but first choice doesn't tell us the unit. It could be anything. Won't it effect the answer choice?
