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The radius of a circle is decreased by 20%. Which of the following opt
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07 Jul 2024, 15:26
07 Jul 2024, 15:26
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The radius of a circle is decreased by 20%. Which of the following options are true?
A. the new area is 64% of the original area
B. the reduced area must be increased by 36% to increase it to the original area
C. the reduced area must be increased by 56.25% to increase it to original area
A. the new area is 64% of the original area
B. the reduced area must be increased by 36% to increase it to the original area
C. the reduced area must be increased by 56.25% to increase it to original area
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Shorter GRE - Preparing for the Quantitative Reasoning Measure
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Free Materials for the GRE General Exam - Where to get it!!
Shorter GRE - Preparing for the Quantitative Reasoning Measure
Shorter GRE - Preparing for the Verbal Reasoning Measure
Re: The radius of a circle is decreased by 20%. Which of the following opt
[#permalink]
22 Sep 2024, 17:24
22 Sep 2024, 17:24
1
Pick a number strategy
r1 = 10 then new radius r2 = 0.8*10 = 8
A1 = 100*pi, A2 = 64*pi
A. A2/A1 = 64% => A is correct
B. 64*pi*1.36 = 87.04*pi < A1 => B is wrong
C. 64*pi*1.5625 = 100*pi = A1 => C is correct
=> A, C
r1 = 10 then new radius r2 = 0.8*10 = 8
A1 = 100*pi, A2 = 64*pi
A. A2/A1 = 64% => A is correct
B. 64*pi*1.36 = 87.04*pi < A1 => B is wrong
C. 64*pi*1.5625 = 100*pi = A1 => C is correct
=> A, C
gmatclubot
Re: The radius of a circle is decreased by 20%. Which of the following opt [#permalink]
22 Sep 2024, 17:24
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