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If x and y are positive integers, what is the value of xy?

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Director
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If x and y are positive integers, what is the value of xy? [#permalink] New post 22 May 2006, 06:19
00:00
A
B
C
D
E

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If x and y are positive integers, what is the value of xy?

1) the greatest common factor of x is 10
2) the lcm of x and y is 180.

Can you please explain?
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 [#permalink] New post 22 May 2006, 08:11
C it is

GCF(X,Y) * LCM(X,Y) = X*Y
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Re: DS [#permalink] New post 22 May 2006, 12:17
remgeo wrote:
If x and y are positive integers, what is the value of xy?

1) the greatest common factor of x is 10
2) the lcm of x and y is 180.


incomplete question..... "greatest common factor of x is 10"? :roll:
Director
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Re: DS [#permalink] New post 22 May 2006, 13:25
Professor wrote:
remgeo wrote:
If x and y are positive integers, what is the value of xy?

1) the greatest common factor of x is 10
2) the lcm of x and y is 180.


incomplete question..... "greatest common factor of x is 10"? :roll:


True - 1) has to be GCF of x and y...

And answer has to be C.
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 [#permalink] New post 22 May 2006, 14:42
If I were taking the test, I would guess C. I know that each is insufficient, but not exactly sure how to break it down far enough to differentiate between C and E.

Anyone?
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 [#permalink] New post 23 May 2006, 02:57
C. Provided 1) means GCF of x and y is 10

GCF(of two numbers) * LCM(of two numbers) = product of the numbers

Hence both the statements are required.
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 [#permalink] New post 16 Jun 2006, 07:17
x242222 wrote:
If I were taking the test, I would guess C. I know that each is insufficient, but not exactly sure how to break it down far enough to differentiate between C and E.

Anyone?


product (x, y) = lcm (x,y) * gcf (x,y)

Thats a formula to mug :)
  [#permalink] 16 Jun 2006, 07:17
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