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GRE Math Challenge #5- x is a positive integer

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GRE Math Challenge #5- x is a positive integer [#permalink] New post 29 May 2014, 02:13
Expert's post
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Question Stats:

50% (00:01) correct 50% (00:08) wrong based on 8 sessions
x is a positive integer

Quantity A

x^2

Quantity B

x^3

A) The quantity in Quantity A is greater
B) The quantity in Quantity B is greater
C) The two quantities are equal
D) The relationship cannot be determined from the information given
[Reveal] Spoiler: OA

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Re: GRE Math Challenge #5- x is a positive integer [#permalink] New post 16 Mar 2017, 01:19
I dont understand? How can it be B? What happens when x is 1? Why is it not D? Please I need help. Please
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Re: GRE Math Challenge #5- x is a positive integer [#permalink] New post 24 Mar 2017, 05:18
Expert's post
soumya1989 wrote:
x is a positive integer

Quantity A

x^2

Quantity B

x^3


Quantity A: x²
Quantity B: x³

Since we know that x² is POSITIVE, we can divide both quantities by x² to get:
Quantity A: 1
Quantity B: x

So, x COULD equal 1, in which case the quantities are EQUAL
Or x COULD equal 2, in which case the Quantity B is greater.

Answer:
[Reveal] Spoiler:
D


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Re: GRE Math Challenge #5- x is a positive integer [#permalink] New post 24 Mar 2017, 05:26
lol
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Re: GRE Math Challenge #5- x is a positive integer [#permalink] New post 14 May 2017, 12:52
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Hello Brent,
I still do not understand why answer is B.
as you mentioned

"So, x COULD equal 1, in which case the quantities are EQUAL
Or x COULD equal 2, in which case the Quantity B is greater. "

from this, both sides can be equal that is 1 or B > A, so answer should be D . Is not it? Am i missing anything? Please let me know.




GreenlightTestPrep wrote:
soumya1989 wrote:
x is a positive integer

Quantity A

x^2

Quantity B

x^3


Quantity A: x²
Quantity B: x³

Since we know that x² is POSITIVE, we can divide both quantities by x² to get:
Quantity A: 1
Quantity B: x

So, x COULD equal 1, in which case the quantities are EQUAL
Or x COULD equal 2, in which case the Quantity B is greater.

Answer: B

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Re: GRE Math Challenge #5- x is a positive integer [#permalink] New post 14 May 2017, 15:55
Expert's post
greMS15 wrote:
Hello Brent,
I still do not understand why answer is B.
as you mentioned

"So, x COULD equal 1, in which case the quantities are EQUAL
Or x COULD equal 2, in which case the Quantity B is greater. "

from this, both sides can be equal that is 1 or B > A, so answer should be D . Is not it? Am i missing anything? Please let me know.




Good catch - thanks!
Silly mistake on my part. I've changed the B to a D

Cheers,
Brent
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Re: GRE Math Challenge #5- x is a positive integer   [#permalink] 14 May 2017, 15:55
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GRE Math Challenge #5- x is a positive integer

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