GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 16 Oct 2019, 11:27

### GMAT Club Daily Prep

#### 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

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

# What is the value of N?

Author Message
TAGS:

### Hide Tags

Intern
Joined: 27 Sep 2010
Posts: 23
What is the value of N?  [#permalink]

### Show Tags

Updated on: 23 Jan 2011, 03:19
4
2
00:00

Difficulty:

25% (medium)

Question Stats:

65% (01:02) correct 35% (01:26) wrong based on 121 sessions

### HideShow timer Statistics

What is the value of N?

(1) (N + 5)^3> 0
(2) (N - 5)^2≤ 0

Originally posted by MichelleSavina on 23 Jan 2011, 02:51.
Last edited by MichelleSavina on 23 Jan 2011, 03:19, edited 1 time in total.
Math Expert
Joined: 02 Sep 2009
Posts: 58381
Re: Q) What is the value of N?  [#permalink]

### Show Tags

23 Jan 2011, 03:15
1
1
MichelleSavina wrote:
Q) What is the value of N?
(1) (N + 5)3> 0
(2) (N - 5)2≤ 0

What is the value of N?

In order the answer to be B it should be as follows:

(1) (N + 5)^3> 0 --> n+5>0 --> n>-5, not sufficient to determine single numerical value of n.

(2) (N - 5)^2≤ 0 --> as square of a number is always non-negative (zero or positive), then (n-5)^2 can not be less than zero thus it must equal to zero: n-5=0 --> n=5. Sufficient.

MichelleSavina please check the questions for typos when posting.
_________________
Intern
Joined: 27 Sep 2010
Posts: 23
Re: Q) What is the value of N?  [#permalink]

### Show Tags

23 Jan 2011, 03:22
1
Bunuel wrote:

What is the value of N?

In order the answer to be B it should be as follows:
.....

edited it.... next time will check it before i post it
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8011
GMAT 1: 760 Q51 V42
GPA: 3.82
Re: What is the value of N?  [#permalink]

### Show Tags

23 Jan 2018, 23:55
MichelleSavina wrote:
What is the value of N?

(1) (N + 5)^3> 0
(2) (N - 5)^2≤ 0

Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.

Since we have 1 variable and 0 equations, D is most likely to be the answer. So, we should consider each of condition one by one first.

Condition 1):
N = 0, N = 1
Since we have many solutions, the condition 1) is not sufficient.

Condition 2)
We have the property (N-5)^2 ≥ 0 and (N-5)^2 ≤ 0 fromt the condition 2).
Since 0≤(N-5)^2 ≤ 0, we have (N-5)^2 = 0 or N = 5.
The condition 2) only is not sufficient.

If the original condition includes “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations” etc., one more equation is required to answer the question. If each of conditions 1) and 2) provide an additional equation, there is a 59% chance that D is the answer, a 38% chance that A or B is the answer, and a 3% chance that the answer is C or E. Thus, answer D (conditions 1) and 2), when applied separately, are sufficient to answer the question) is most likely, but there may be cases where the answer is A,B,C or E.
_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only \$79 for 1 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"
Non-Human User
Joined: 09 Sep 2013
Posts: 13208
Re: What is the value of N?  [#permalink]

### Show Tags

14 May 2019, 00:32
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: What is the value of N?   [#permalink] 14 May 2019, 00:32
Display posts from previous: Sort by