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

It is currently 20 Jun 2018, 02:30

Close

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
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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

What is the value of w?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

2 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 22 Dec 2009
Posts: 324
GMAT ToolKit User
What is the value of w? [#permalink]

Show Tags

New post Updated on: 04 Jan 2014, 06:16
2
7
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

59% (01:21) correct 41% (01:07) wrong based on 289 sessions

HideShow timer Statistics

What is the value of w?

(1) \(w^2=18\)

(2) \(\frac{w^3}{\sqrt{18}}\) is an integer

Source: PR 1012

_________________

Cheers!
JT...........
If u like my post..... payback in Kudos!! :beer

|Do not post questions with OA|Please underline your SC questions while posting|Try posting the explanation along with your answer choice|
|For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|


~~Better Burn Out... Than Fade Away~~


Originally posted by jeeteshsingh on 10 Mar 2010, 03:43.
Last edited by Bunuel on 04 Jan 2014, 06:16, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
Expert Post
2 KUDOS received
CEO
CEO
User avatar
B
Joined: 17 Nov 2007
Posts: 3486
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
GMAT ToolKit User Premium Member
Re: What is the value of w? [#permalink]

Show Tags

New post 10 Mar 2010, 04:32
2
2
1) \(w^2=18\) ---> \(w=\pm\sqrt{18}\). Insufficient.

2) \(\frac{w^3}{\sqrt{18}}\) is an integer. if \(w^3 = n*\sqrt{18}\), where n is an integer, we will get infinite number of possible answers. Insufficient.

1)&2) \(\frac{w^3}{\sqrt{18}}=\frac{18*\pm\sqrt{18}}{\sqrt{18}}=\pm18\). Two integers satisfies both conditions. Insufficient
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

SVP
SVP
User avatar
Joined: 06 Sep 2013
Posts: 1883
Concentration: Finance
GMAT ToolKit User
Re: What is the value of w? [#permalink]

Show Tags

New post 27 Apr 2014, 07:06
This is how I solved.

First statement clearly W could be equal to either 3 sqrt (2) or -3 sqrt (2), therefore insufficient.
Second statement, w^3 / sqrt (18) is an integer this doesn't really tell us much.

Both statements together, if we factorize w^3 as w*w^2 and replace statement 1 in this equation we will have 18w = sqrt (18) * k, where 'k' is an integer.

Therefore after simplifying we are left with w = k / sqrt (18), where 'k' is an integer. Since 'k' could be any number there is NOT a definite value for 'w' and thus answer is E.

Hope this helps
Cheers
J :)
SVP
SVP
User avatar
Joined: 06 Sep 2013
Posts: 1883
Concentration: Finance
GMAT ToolKit User
Re: What is the value of w? [#permalink]

Show Tags

New post 30 Apr 2014, 05:40
I also did it this way. First statement w^2 = 18. Now we don't know the sign of w, so abs (w) = sqrt (18). Insufficient. Statement 2 only tells us that w^3 = sqrt (18)(k) where 'k' is an integer. Both together we can replace w^2 in the second staetment and we get that w = sqrt (18) (k) where 'k' could be any integer.

Hence insufficient too.

Answer: E
Hope this helps
Cheers
J :)
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 7006
Premium Member
Re: What is the value of w? [#permalink]

Show Tags

New post 22 Jan 2018, 06:58
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.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: What is the value of w?   [#permalink] 22 Jan 2018, 06:58
Display posts from previous: Sort by

What is the value of w?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.