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If xy = 165

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If xy = 165

by gmat740 » Sun Aug 16, 2009 7:58 am
If xy = 165, where x and y are positive integers and x > y, what is the least possible value of x – y ?
A. 2
B. 4
C. 8
D. 15
E. 28

[spoiler]OA-B
IMO-C[/spoiler]

X=13
Y=5

X-Y = 8
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Re: If xy = 165

by mohitsharda » Sun Aug 16, 2009 8:22 am
gmat740 wrote:If xy = 165, where x and y are positive integers and x > y, what is the least possible value of x – y ?
A. 2
B. 4
C. 8
D. 15
E. 28

[spoiler]OA-B
IMO-C[/spoiler]

X=13
Y=5

X-Y = 8
Dude, u got the question wrong. It says 165 and not 65.

so, X=15, Y=11
and hence 4
MS
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Re: If xy = 165

by dtweah » Sun Aug 16, 2009 8:22 am
gmat740 wrote:If xy = 165, where x and y are positive integers and x > y, what is the least possible value of x – y ?
A. 2
B. 4
C. 8
D. 15
E. 28

[spoiler]OA-B
IMO-C[/spoiler]

X=13
Y=5

X-Y = 8
prime Factor 165.
5 x 3 x 11.

Now find all combition of XY where X>Y

(15,11)
(33,5)
(55,3)

Of these X-Y is least with (15,11)
15-11=4.
Choose B.
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by gmat740 » Sun Aug 16, 2009 9:02 am
Ahh...Silly Karan!:P

Thanks a lot friends....
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