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X and Y are positive integers, what is the value of X and Y?

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X and Y are positive integers, what is the value of X and Y? [#permalink]

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New post 19 Jan 2009, 19:09
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Another question :)

X and Y are positive integers, what is the value of X and Y?

1) the greatest common factor of X and Y is 10
2) the least common multiple of X and Y is 180

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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 19 Jan 2009, 20:32
ongste wrote:
Another question :)

X and Y are positive integers, what is the value of X and Y?

1) the greatest common factor of X and Y is 10
2) the least common multiple of X and Y is 180


The question is, I think, modified. E is the best
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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 19 Jan 2009, 21:13
ongste wrote:
Another question :)

X and Y are positive integers, what is the value of X and Y?

1) the greatest common factor of X and Y is 10
2) the least common multiple of X and Y is 180



If the question is what is the value of XY ? -- then answer C
XY = LCM * GCM

If the question is what are the values of X and Y? then answer E
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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 19 Jan 2009, 21:54
X and Y are positive integers, what is the value of X and Y?

1) the greatest common factor of X and Y is 10
2) the least common multiple of X and Y is 180



yup having given the question to find xy the answer would be C as x y = lcm x gcd

if its find x and y then the answer would be E.

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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 19 Jan 2009, 23:12
Sorry, made a typing error.. should be

X and Y are positive integers, what is the value of XY?

1) the greatest common factor of X and Y is 10
2) the least common multiple of X and Y is 180

and the OA is C

Can someone please explain how to answer this question?
thanks

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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 20 Jan 2009, 01:20
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x.y = Greatest Common Factor (x,y) . Least common multiple (x,y)
This is a formula (for example/proof, see http://en.wikipedia.org/wiki/Least_common_multiple)

So you need both statements and thus answer is C.

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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 20 Jan 2009, 02:50
IMO c

The formula is :

Product of two numbers = HCF * LCM

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Re: DS: LCM and GCF...gmat prep [#permalink]

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New post 20 Jan 2009, 10:10
Right that is the property.

xy=1800

gurpreet07 wrote:
IMO c

The formula is :

Product of two numbers = HCF * LCM

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Re: DS: LCM and GCF...gmat prep   [#permalink] 20 Jan 2009, 10:10
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