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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]

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08 Oct 2012, 02:55
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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 Bunuel on 29 Oct 2013, 00:25, edited 2 times in total.
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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08 Oct 2012, 02:55
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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.

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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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.

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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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

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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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]

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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

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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11 Oct 2012, 14:27
Expert's post
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.

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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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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.

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
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Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]

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15 Oct 2012, 15:28
Expert's post
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.

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]

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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]

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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]

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01 Jan 2013, 02:42
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]

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28 Oct 2013, 21:13
fameatop wrote:
Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

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]

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29 Oct 2013, 02:22
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

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]

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29 Oct 2013, 07:44
Bunuel wrote:
selfishmofo wrote:
fameatop wrote:
Reducing Stem we get
n = s + 6
1) s=2--> n=8 ---> Sufficient
2) s=n/4 --->Sufficient

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]

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29 Oct 2013, 07:47
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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Re: What is the value of n in the equation - 25 + 19 + n = S ? [#permalink]

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Re: What is the value of n in the equation - 25 + 19 + n = S ?   [#permalink] 05 May 2015, 14:22
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