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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, 01:55
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A
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D
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80% (01:36) correct 19% (00:46) wrong based on 164 sessions

Last edited by Bunuel on 28 Oct 2013, 23:25, edited 2 times 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, 01:55
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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, 02:10
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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 11 Oct 2012, 10:51
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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 08 Oct 2012, 02:09
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, 02:14
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, 13:27
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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 15 Oct 2012, 13:36
Expert's post
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, 14:28
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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, 06:33
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, 22:47
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, 01:42
Expert's post
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 = 5 ? [#permalink] New post 28 Oct 2013, 20:13
fameatop wrote:
Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

Answer D


For the second statement: I know I should stop after knowing that it's a linear-with one unknown, I'm rusty on my math, how does this become

I get this, N/S=4
S=4N (multiply each side)
(lost in this step) I did the following
N=S+6
N=4N+6
-3N=6
3 3
N=-2, (should be positive)

Not sure how I got a negative, I guessed correctly, the second time i worked the problem. I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. thanks.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 29 Oct 2013, 01:22
Expert's post
selfishmofo wrote:
fameatop wrote:
Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

Answer D


For the second statement: I know I should stop after knowing that it's a linear-with one unknown, I'm rusty on my math, how does this become

I get this, N/S=4
S=4N (multiply each side)
(lost in this step) I did the following
N=S+6
N=4N+6
-3N=6
3 3
N=-2, (should be positive)

Not sure how I got a negative, I guessed correctly, the second time i worked the problem. I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. thanks.


Not sure I understand everything in your post but n/s = 4 means n = 4s (multiply both sides by s) not s = 4n.

Hope it helps.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 29 Oct 2013, 06:44
Bunuel wrote:
selfishmofo wrote:
fameatop wrote:
Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

Answer D


For the second statement: I know I should stop after knowing that it's a linear-with one unknown, I'm rusty on my math, how does this become

I get this, N/S=4
S=4N (multiply each side)
(lost in this step) I did the following
N=S+6
N=4N+6
-3N=6
3 3
N=-2, (should be positive)

Not sure how I got a negative, I guessed correctly, the second time i worked the problem. I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. thanks.


Not sure I understand everything in your post but n/s = 4 means n = 4s (multiply both sides by s) not s = 4n.

Hope it helps.



I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. Thank you for the other concept, I missed that small detail in trying to explain the problem.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink] New post 29 Oct 2013, 06:47
Expert's post
selfishmofo wrote:
Bunuel wrote:
selfishmofo wrote:

For the second statement: I know I should stop after knowing that it's a linear-with one unknown, I'm rusty on my math, how does this become

I get this, N/S=4
S=4N (multiply each side)
(lost in this step) I did the following
N=S+6
N=4N+6
-3N=6
3 3
N=-2, (should be positive)

Not sure how I got a negative, I guessed correctly, the second time i worked the problem. I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. thanks.


Not sure I understand everything in your post but n/s = 4 means n = 4s (multiply both sides by s) not s = 4n.

Hope it helps.



I'm not sure how the MGMAT guide states that the number becomes S=1/4N, maybe so it's not negative, it's placed with a fraction? Can someone refresh me with that concept. Thank you for the other concept, I missed that small detail in trying to explain the problem.


n = 4s --> s = \frac{n}{4} or \frac{1}{4}*n (it's not \frac{1}{4n}).
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COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: What is the value of n in the equation - 25 + 19 + n = 5 ?   [#permalink] 29 Oct 2013, 06:47
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