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31 Jan 2016, 07:00
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C
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:
84% (00:53) correct
16%
(00:53)
wrong
based on 136
sessions
History
Date
Time
Result
Not Attempted Yet
If the radius of a circle is decreased 20%, what happens to the area?
A. 10% decrease
B. 20% decrease
C. 36% decrease
D. 40% decrease
E. 50% decrease
A. 10% decrease
B. 20% decrease
C. 36% decrease
D. 40% decrease
E. 50% decrease
31 Jan 2016, 07:09
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Bunuel
Area of Square = Pi* radius^2
New Radius = 4/5 * old radius
so new area = (4/5)^2 old area => 16/25 of old area => 64% old area
Ans : C
02 Feb 2016, 11:31
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Hi All,
While this question isn't really written in proper "GMAT style", the basic concepts that are tested here will show up on Test Day. This question can be solved by TESTing VALUES.
We're told that the radius of a circle is decreased 20%. We're asked what happens to the area (as a measure of percentage change).
IF....
Original Radius = 10
Original Area = pi(R^2) = 100pi
New Radius = 8
New Area = pi(R^2) = 64pi
Percentage Change = (New - Old)/Old = (64pi - 100pi)/100pi = -36pi/100pi = -36% = 36% decrease
Final Answer:
GMAT assassins aren't born, they're made,
Rich
While this question isn't really written in proper "GMAT style", the basic concepts that are tested here will show up on Test Day. This question can be solved by TESTing VALUES.
We're told that the radius of a circle is decreased 20%. We're asked what happens to the area (as a measure of percentage change).
IF....
Original Radius = 10
Original Area = pi(R^2) = 100pi
New Radius = 8
New Area = pi(R^2) = 64pi
Percentage Change = (New - Old)/Old = (64pi - 100pi)/100pi = -36pi/100pi = -36% = 36% decrease
Final Answer:
GMAT assassins aren't born, they're made,
Rich
