Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]
08 Oct 2012, 01:55

1

This post received KUDOS

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.

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

Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]
11 Oct 2012, 13:27

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.

Answer: D.

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

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

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 ??'

Re: What is the value of n in the equation - 25 + 19 + n = 5 ? [#permalink]
15 Oct 2012, 14:28

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.

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. _________________

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

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

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

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

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

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