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# What is the value of n in the equation: -25+19+n=s

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Manager
Joined: 27 Mar 2008
Posts: 72
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What is the value of n in the equation: -25+19+n=s [#permalink]  21 Apr 2008, 03:23
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5% (low)

Question Stats:

85% (01:40) correct 15% (00:10) wrong based on 46 sessions
What is the value of n in the equation $$-25 + 19 + n = s$$ ?

(1) $$s = 2$$
(2) $$\frac{n}{s} = 4$$
[Reveal] Spoiler: OA
Director
Joined: 14 Jan 2007
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Re: DS [#permalink]  21 Apr 2008, 06:35
dishant007 wrote:
What if s=0?

s can't be zero in this question because n/s =4, which is defined.
if s =0, n/s would be infinity, which is not the case here.
SVP
Joined: 04 May 2006
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Schools: CBS, Kellogg
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Re: DS [#permalink]  21 Apr 2008, 18:59
vshaunak@gmail.com wrote:
dishant007 wrote:
What if s=0?

s can't be zero in this question because n/s =4, which is defined.
if s =0, n/s would be infinity, which is not the case here.

Good question,
The same to me, we are falling in the trap. I wonder why it is easy, but it still be posted here? And I found the trap very interesting. Worthy to know it!

When we assume n/s =4 that n = 4s, the condition attached to it must be s is not zero. But nobody tell us that s is none zero. So it is not sufficient to solve!

Interesting!
_________________
Re: DS   [#permalink] 21 Apr 2008, 18:59
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# What is the value of n in the equation: -25+19+n=s

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