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Is rs = rx − 2 ?

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Is rs = rx − 2 ? [#permalink] New post 21 Aug 2013, 16:51
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E

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  55% (hard)

Question Stats:

60% (02:06) correct 40% (01:00) wrong based on 50 sessions
Is rs = rx − 2 ?

(1) r is an odd number
(2) x = s + 2
[Reveal] Spoiler: OA

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Asif vai.....

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Re: Is rs = rx − 2 ? [#permalink] New post 22 Aug 2013, 01:58
Expert's post
Is rs = rx − 2 ?

Is rs = rx-2? --> is r(x-s)=2?

(1) r is an odd number. Not sufficient: consider r=1 and x-s=2 AND r=1 and x-s=3.

(2) x = s + 2 -->x-s=2 --> the question becomes: is r=1? We don't know that. Not sufficient.

(1)+(2) From (2) the question became: is r=1? and (1) says that r=odd, but we don't know whether it's 1 or any other odd number. Not sufficient.

Answer: E.
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Re: Is rs = rx − 2 ? [#permalink] New post 22 Aug 2013, 03:04
Asifpirlo wrote:
Is rs = rx − 2 ?

(1) r is an odd number
(2) x = s + 2


rs = rx − 2 can be restated as
r(x-s) = 2 -----(1)

Statement 1
r is odd, Still we don't know the value of (x-s).
Thus Insufficient

Statement 2
This is very tempting option for many of us.
(x-s)=2.
we don't know the value of r.
Thus Insufficient

Statement 1& 2
r= odd (can take any odd value 1, 3, 5 etc)
(x-s)=2.
r(x-s) will equal 2 only if r=1. But we don't know value of r for sure
Thus Insufficient

Answer E
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Re: Is rs = rx − 2 ?   [#permalink] 22 Aug 2013, 03:04
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