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What is the value of n in the equation  25 + 19 + n = S ?
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Originally posted by Bunuel on 08 Oct 2012, 01:55.
Last edited by adkikani on 24 Mar 2018, 22:36, edited 3 times in total.
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Re: What is the value of n in the equation  25 + 19 + n = S ?
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08 Oct 2012, 01:55



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Re: What is the value of n in the equation  25 + 19 + n = S ?
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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 = S ?
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08 Oct 2012, 02:10
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 = S ?
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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 = S ?
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11 Oct 2012, 10:51
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 = 2sufficient (2) n/s = 4 => s=n/4sufficient Answer : D
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Re: What is the value of n in the equation  25 + 19 + n = S ?
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11 Oct 2012, 13:27



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Re: What is the value of n in the equation  25 + 19 + n = S ?
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15 Oct 2012, 13:36
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.
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 = S ?
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15 Oct 2012, 14:28
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 crossmultiply.
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Re: What is the value of n in the equation  25 + 19 + n = S ?
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16 Oct 2012, 06:33
1)n6=2 .. sufficient 2)n/4=s or,n6=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 ?
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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 ?
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01 Jan 2013, 01:42



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Re: What is the value of n in the equation  25 + 19 + n = S ?
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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 linearwith 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 = S ?
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29 Oct 2013, 01:22
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 linearwith 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 = S ?
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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 linearwith 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 = S ?
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29 Oct 2013, 06:47
selfishmofo wrote: Bunuel wrote: selfishmofo wrote: For the second statement: I know I should stop after knowing that it's a linearwith 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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