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data suff powers

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Manager
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data suff powers [#permalink] New post 12 Oct 2008, 19:16
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I just came by this one and have no idea how the answer could be A. Could somebody please explain...
Q10:
If x and y are positive integers, what is the value of x?
(1) 3x5y = 1,125 (x and y are power signs)
(2) y = 3
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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Re: data suff powers [#permalink] New post 12 Oct 2008, 19:21
whats the source of this question?

i dont see how the OA can be A

guess i missed the powers :)
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Last edited by spiridon on 13 Oct 2008, 05:55, edited 1 time in total.
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Re: data suff powers [#permalink] New post 12 Oct 2008, 19:30
IMO A:

3^x5^y = 1125

now 1125 = 125 * 9
= 5^3* 3^2

means x = 2 and y = 3 ( x and y are positive integers is given in problem statement)

Definately A is sufficient.

B is not suff.

Thanks
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Re: data suff powers [#permalink] New post 12 Oct 2008, 19:41
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Thank you!!!!!!!
But... why not D?
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Re: data suff powers [#permalink] New post 12 Oct 2008, 19:57
linau1982 wrote:
I just came by this one and have no idea how the answer could be A. Could somebody please explain...
Q10:
If x and y are positive integers, what is the value of x?
(1) 3x5y = 1,125 (x and y are power signs)
(2) y = 3


linau1982 wrote:
Thank you!!!!!!!
But... why not D?


Statement 2 does not give us ANY info about "x". So we can ignore it (yes ! as simple as that :) )
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Re: data suff powers [#permalink] New post 13 Oct 2008, 05:53
[quote="linau1982"]I just came by this one and have no idea how the answer could be A. Could somebody please explain...
Q10:
If x and y are positive integers, what is the value of x?
(1) 3x5y = 1,125 (x and y are power signs)
(2) y = 3

1125 = 3^2 * 5^3

from one.............suff

from 2

irrelevant .....insuff

A
Re: data suff powers   [#permalink] 13 Oct 2008, 05:53
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