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sandy
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a > 0 [#permalink] New post   09 May 2015, 11:09
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\(a>0\)


Quantity A
Quantity B
\((4\sqrt{(5a)})^2\)
\(40a\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

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GreenlightTestPrep
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Re: GRE Math Challenge #91 [#permalink] New post   18 May 2015, 11:18
sandy wrote:
a > 0
Quantity A: \((4\sqrt{(5a)})^2\)
Quantity B: 40a


Quantity A:
[4√(5a)]² = [4√(5a)][4√(5a)]
= (16)(5a)
= 80a

So, we have:
Quantity A: 80a
Quantity B: 40a

Subtract 40a from both quantities to get:
Quantity A: 40a
Quantity B: 0

Divide both quantities by 40 to get:
Quantity A: a
Quantity B: 0

The given information tells us that a > 0, so the correct answer is
Show: ::
A


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Brent
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abbasiime
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Re: GRE Math Challenge #91- a>0 [#permalink] New post   02 Oct 2017, 01:56
80a 40a
2 1 on dividing
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Re: a > 0 [#permalink] New post   11 Dec 2019, 10:05
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Re: a > 0 [#permalink] New post   15 Jun 2021, 09:12
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: a > 0 [#permalink]
15 Jun 2021, 09:12
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