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If |n + 5| = 5, what is the value of n?  [#permalink]

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If |n + 5| = 5, what is the value of n?

(1) n^2 is not equal to 0.
(2) n^2 + 10n = 0.

Originally posted by anandhimanshu85 on 14 May 2011, 06:33.
Last edited by Bunuel on 12 Jul 2013, 02:05, edited 1 time in total.
Edited the question.
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$$n$$ could equals 0 or -10.
From 1) we have that n doesn't equal 0, so $$n=10$$, suff
From 2) $$n=0$$or $$n=-10$$ ins

(A)
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|n+5| = 5 means,

n= 0 or -10.

a gives n= -10 sufficient.

b gives n=0 or -10. Not sufficient.

A.
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If |n + 5| = 5, what is the value of n?  [#permalink]

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shakticnb wrote:
If | n + 5 | = 5, what is the value of n?

(1) n ^ 2 is not equal to 0.

(2) n ^ 2 + 10n = 0

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

*EXPLAIN IN DETAIL

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Given |n+5| = 5 , this means that either n=0 or n =-10 and the question asks us what is the value of n?

Per statement 1, $$n^2$$ $$\neq$$0 ---> n$$\neq$$ 0 ---> n = -10 is the only value possible. Thus this statement is sufficient.

Per statement 2, $$n^2$$+10n=0 --> n(n+10) = 0 ---> either n = 0 or n = -10. This still does not give 1 unique value. This statement is not sufficient.

A is the correct answer.
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GMAT 1: 760 Q50 V44 Re: If |n + 5| = 5, what is the value of n?  [#permalink]

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shakticnb wrote:
If | n + 5 | = 5, what is the value of n?

(1) n ^ 2 is not equal to 0.

(2) n ^ 2 + 10n = 0

Given: | n + 5 | = 5 => (n+5) = 5 or -5. Hence n = 0 or -10
Required: n =? This means we have to find a definitive value of n

Statement 1: $$n^{2}$$ ≠ 0
Hence n ≠ 0.
This leaves us with only one value of n = -10.

SUFFICIENT

Statement 2:
$$n^{2}$$ + 10n = 0
or n(n + 10) = 0
This gives us n = 0 and -10.
Still we do not have a unique value of n

INSUFFICIENT

So, the correct answer is A
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If |n + 5| = 5, what is the value of n?  [#permalink]

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1
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and equations ensures a solution.

If |n + 5| = 5, what is the value of n?

(1) n^2 is not equal to 0.
(2) n^2 + 10n = 0.

Transforming the original codntiion we have n+5=-5,5, n=-10,0. Since there is 1 variable (n), we need 1 equation to match the number of variable and equation. Since there is 1 each in 1) and 2), D is likely the answer.

In case of 1), since n is not 0, n = 10 this is a unique answer and therefore is sufficient.
In case of 2), n(n+10)=0, n=0,-10 therefore it is not unique. Thus it is not sufficient.
The answer is A.
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If |n + 5| = 5, what is the value of n?  [#permalink]

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Solution:
Given: |n + 5| = 5
Inferences: |n + 5| = 5, this means we can get two cases here;
A. n + 5 = 5
n = 0

B. n + 5 = -5
n = -10
Therefore |n + 5| = 5 will be true when n = 0 or -10.
To find: The value of “n”.

Analysis of statement 1: $$n^2$$ is not equal to 0.
$$n^2$$ ≠0; this means that, n ≠0.
Therefore n value must be “-10”.
Hence statement 1 is sufficient to answer. We can eliminate options B, C and E.

Analysis of statement 2: $$n^2+ 10n=0$$
$$n^2+ 10n=0$$
$$n (n+10)= 0$$
This means n = 0 or n = -10
We are getting two values for “n”, hence statement 2 is insufficient. So we can eliminate option D.

The correct answer option is “A”.
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GMAT Mentors Originally posted by Byjus on 23 Feb 2017, 04:45.
Last edited by Byjus on 14 Dec 2018, 23:48, edited 4 times in total.
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Re: If |n + 5| = 5, what is the value of n?  [#permalink]

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anandhimanshu85 wrote:
If |n + 5| = 5, what is the value of n?

(1) n^2 is not equal to 0.
(2) n^2 + 10n = 0.

Two ways to approach absolute value

n +5 =5
n =0

-ln +5l =5
-n -5 =5
-n =10
n= -10

Stmnt 1

Suff because it cannot be the other x value

Stmnt 2

n( n +10) =0

n =- 10, n =0

Insuff

A
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Re: If |n + 5| = 5, what is the value of n? (1) n^2 is not equal  [#permalink]

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