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20 Oct 2021, 04:00
Kudos
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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:
5%
(low)
Question Stats:
95% (00:49) correct
5%
(00:36)
wrong
based on 57
sessions
History
Date
Time
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Not Attempted Yet
A cylindrical water tank has a stripe painted around its circumference, as shown in the figure provided. What is the surface area of this stripe?
(1) y = 0.7
(2) The height of the tank is 2 meters.
Attachment:
1.jpg [ 7.68 KiB | Viewed 1580 times ]
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
20 Oct 2021, 06:35
Kudos
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A) Insufficient , because to find this stripe surface , we will use the type : 2πr^2 + 2πr*h = Surface , so we need r to find this.
B) Insufficient . In order to solve this we need r and h.
Correct E . Because with the combination of the evidences , we cannot find r , and therefore we cannot find the surface
B) Insufficient . In order to solve this we need r and h.
Correct E . Because with the combination of the evidences , we cannot find r , and therefore we cannot find the surface
20 Oct 2021, 06:39
Kudos
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Bunuel
Breaking Down the Info:
If we treat the surface area as a strip, we can cut it open and see it is a rectangle when laid flat. The width of this rectangle is y, and the length of this rectangle would be the circumference of the cylinder. Then finding the surface area requires us to know the product of y and the radius of the cylinder.
Rephrase the question:
What is \(y * r\)?
Statement 1 Alone:
Gives us y, but we still need r, so insufficient.
Statement 2 Alone:
The height of the cylinder is actually not helpful at all, so insufficient.
Both Statements Combined:
Since statement 2 contributed no information, combined it is insufficient.
Answer: E
Note that we don't have to find y and r individually, and knowing the product \(y*r\) would be sufficient.
