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If x and y are greater than 0, is x = 1 ?

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Senior Manager
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If x and y are greater than 0, is x = 1 ? [#permalink] New post 10 Sep 2011, 03:46
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54% (01:45) correct 46% (00:35) wrong based on 38 sessions
If x and y are greater than 0, is x = 1 ?

(1) x/y = 1
(2) xy = 1
[Reveal] Spoiler: OA

Last edited by Bunuel on 28 Sep 2014, 10:29, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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Re: If x and y are greater than 0, is x = 1 ? [#permalink] New post 10 Sep 2011, 04:00
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DeeptiM wrote:
If x and y are greater than 0, is x=1?

1) x/y=1
2) xy=1


ST 1
x/y=1 and this means x=y so x and y can be 1 , 2, 3 , 4 , .......
EX : 5/5=1 4/4=1 1000/1000=1
NOT sufficient

ST2
xy=1 and means x=1/y so x can be 1/5 so y = 5
EX" 1/5 * 5 = 1
also not sufficient

ST1 & ST2
x=y and xy=1
you can simply find that xx=1 this means x^2 = 1 so x= +1 or x= -1
and because y and x must be larger than 0 so x must be +1
sufficient


the answer is C
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Re: If x and y are greater than 0, is x = 1 ? [#permalink] New post 10 Sep 2011, 05:05
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yup.. C.. nicely explained silver
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Re: If x and y are greater than 0, is x = 1 ? [#permalink] New post 10 Sep 2011, 05:09
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viks4gmat wrote:
yup.. C.. nicely explained silver

thanks :wink:
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Re: If x and y are greater than 0, is x = 1 ? [#permalink] New post 28 Sep 2014, 10:09
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Re: If x and y are greater than 0, is x = 1 ?   [#permalink] 28 Sep 2014, 10:09
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