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What is the value of n in the equation - 25 + 19 + n = S ?

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What is the value of n in the equation - 25 + 19 + n = S ? [#permalink] New post 08 Oct 2012, 02:55
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The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

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

(1) s = 2
(2) n/s = 4

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Last edited by hamm0 on 16 Oct 2012, 08:06, edited 1 time in total.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 08 Oct 2012, 02:55
SOLUTION

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

(1) s = 2 --> - 25 + 19 + n = 2. We have a linear equation with one unknown, hence we can solve for it. Sufficient.
(2) n/s = 4 --> s=n/4 --> - 25 + 19 + n = n/4. We have a linear equation with one unknown, hence we can solve for it. Sufficient.

Answer: D.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 08 Oct 2012, 03:09
St 1: Sufficient: Substitute S=2 in 25+19+n=2, Value of n can be found out from this linear equation.
St 2: Sufficient: Substitute s=n/4 in 25+19+n=n/4, Value of n can be found out from this linear equation.

Hence Answer D
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 08 Oct 2012, 03:10
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Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

Answer D
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 08 Oct 2012, 03:14
IMO D..
each statement alone is sufficient
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 11 Oct 2012, 11:51
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What is the value of n in the equation - 25 + 19 + n = s ?

If we have s known then, we can easily find n.

(1) s = 2--------sufficient
(2) n/s = 4
=> s=n/4------sufficient

Answer : D
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 11 Oct 2012, 14:27
SOLUTION

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

(1) s = 2 --> - 25 + 19 + n = 2. We have a linear equation with one unknown, hence we can solve for it. Sufficient.
(2) n/s = 4 --> s=n/4 --> - 25 + 19 + n = n/4. We have a linear equation with one unknown, hence we can solve for it. Sufficient.

Answer: D.

Kudos points given to everyone with correct solution. Let me know if I missed someone.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 11 Oct 2012, 16:19
(1) sufficient
(2) sufficient

My Answer is D.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 15 Oct 2012, 14:36
Bunuel wrote:
SOLUTION

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

(1) s = 2 --> - 25 + 19 + n = 2. We have a linear equation with one unknown, hence we can solve for it. Sufficient.
(2) n/s = 4 --> s=n/4 --> - 25 + 19 + n = n/4. We have a linear equation with one unknown, hence we can solve for it. Sufficient.

Answer: D.

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D straight Bunuel but could someone think about n/s=4 that n and s can be both positive or negative ?? 16/4 = 4 or -16/-4 = 4 so is not safely to cross multiply S ?? or this concern regards questions in which < or > are involved ??'

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 15 Oct 2012, 15:28
carcass wrote:
Bunuel wrote:
SOLUTION

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

(1) s = 2 --> - 25 + 19 + n = 2. We have a linear equation with one unknown, hence we can solve for it. Sufficient.
(2) n/s = 4 --> s=n/4 --> - 25 + 19 + n = n/4. We have a linear equation with one unknown, hence we can solve for it. Sufficient.

Answer: D.

Kudos points given to everyone with correct solution. Let me know if I missed someone.



D straight Bunuel but could someone think about n/s=4 that n and s can be both positive or negative ?? 16/4 = 4 or -16/-4 = 4 so is not safely to cross multiply S ?? or this concern regards questions in which < or > are involved ??'

Thanks


You should be concerned about the signs only with inequalities. For equations you can safely cross-multiply.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 16 Oct 2012, 07:33
1)n-6=2 .. sufficient
2)n/4=s or,n-6=n/4 -- sufficient. so answer is D
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Re: What is the value of n in the equation - 25 + 19 + n = S ? [#permalink] New post 31 Dec 2012, 23:47
hello, for statement (2), what if

n=4 and s=1

then -25 + 19 + 4 = -2
but s=1 NOT GOOD

also consider if n=8 and s=2

then -25 + 19 + 8 = 2
and s = 2 GOOD

since it is possible to pick different sets of numbers that yield conflicting answers, shouldn't this statement alone be insufficient? (refer to OG13 DS#41 for comparison)
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Re: What is the value of n in the equation - 25 + 19 + n = S ? [#permalink] New post 01 Jan 2013, 02:42
chekitsch wrote:
hello, for statement (2), what if

n=4 and s=1

then -25 + 19 + 4 = -2
but s=1 NOT GOOD

also consider if n=8 and s=2

then -25 + 19 + 8 = 2
and s = 2 GOOD

since it is possible to pick different sets of numbers that yield conflicting answers, shouldn't this statement alone be insufficient? (refer to OG13 DS#41 for comparison)


n=4 and s=1 do not satisfy - 25+19+n=s.

We have two equations: - 25+19+n=s and n/s=4. Solving gives n=8 and s=2.
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Re: What is the value of n in the equation - 25 + 19 + n = S ?   [#permalink] 01 Jan 2013, 02:42
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