Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Aug 2014, 22:46

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

x+y+z

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Status: It's "Go" Time.......
Affiliations: N.C.C.
Joined: 22 Feb 2011
Posts: 180
Location: India
Followers: 5

Kudos [?]: 21 [0], given: 2

GMAT ToolKit User GMAT Tests User
x+y+z [#permalink] New post 02 May 2011, 12:35
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

36% (02:21) correct 64% (00:51) wrong based on 12 sessions
Image
_________________

We are twice armed if we fight with faith.

He who knows when he can fight & when He can't will be victorious.

Expert Post
1 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 4668
Location: Pune, India
Followers: 1072

Kudos [?]: 4774 [1] , given: 163

Re: x+y+z [#permalink] New post 02 May 2011, 17:19
1
This post received
KUDOS
Expert's post
MSDHONI wrote:
Image


When I see more than one '=', my instinct is to make them equal to k to get to a 'common ground'.

3x = 4y = 7z = k

x = \frac{k}{3}; y = \frac{k}{4}; z = \frac{k}{7}
Now, all x, y and z are positive integers so k should be divisible by 3, 4 and 7. The minimum value of k will be 3*4*7.

x + y + z = \frac{k}{3} + \frac{k}{4} + \frac{k}{7} = \frac{3*4*7}{3} + \frac{3*4*7}{4} + \frac{3*4*7}{7} = 61
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Save $100 on Veritas Prep GMAT Courses And Admissions Consulting
Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options.

Veritas Prep Reviews

Manager
Manager
avatar
Status: Never give up!
Affiliations: Beta Gamma Sigma, Omicron Delta Epsilon, Toastmasters Intl, HHonors
Joined: 04 Nov 2009
Posts: 224
Location: Raleigh-Durham NC
Followers: 2

Kudos [?]: 42 [0], given: 27

GMAT Tests User
Re: x+y+z [#permalink] New post 02 May 2011, 13:15
I believe it's D. The solution is the lowest common multiplier. Both 3 and 7 are prime numbers and odd, while 4 is a multiple of 2, which doesn't help with the other two. So if you multiply 3, 4, and 7, you get 84. If you deduce further, x = 28, y = 21, z = 12, just the product of the 2 numbers left after the reference. So the sum is 61.

If there's any hole in my reasoning, I welcome comments. As I can benefit from it too :-)
(Thanks in advance.)
_________________

= = = = = = = = = =

If you liked my post, please consider a Kudos for me. Thanks!

SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1692
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 285 [0], given: 36

GMAT Tests User Premium Member Reviews Badge
Re: x+y+z [#permalink] New post 02 May 2011, 17:17
x + y + z = 3x/4 + x + 3x/7

= (21 + 28 + 12 )x/28 = 61x/28

61 is not divisible by 28(it's a prime #), so for least value, x = 28

Answer - D
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

Get the best GMAT Prep Resources with GMAT Club Premium Membership

VP
VP
avatar
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 1365
Followers: 11

Kudos [?]: 135 [0], given: 10

GMAT Tests User
Re: x+y+z [#permalink] New post 03 May 2011, 00:53
x= (4/3)y = (7/3)z
x+y+z = (61/28)x. Since 61 is a Prime number,x has to be 28.
thus 61.
_________________

Visit -- http://www.sustainable-sphere.com/
Promote Green Business,Sustainable Living and Green Earth !!

Re: x+y+z   [#permalink] 03 May 2011, 00:53
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic Is xyz = 1? Asmn 1 13 Jul 2013, 19:55
Experts publish their posts in the topic Sales of ABC and XYZ danzig 3 08 Feb 2013, 10:44
2 Experts publish their posts in the topic If integers x, y and z are greater than 1 what is the value rishi2377 15 22 Oct 2008, 10:54
Experts publish their posts in the topic What is the value of x/yz? financeguy25 7 08 Mar 2009, 18:28
ps- gmatprep - xyz hsk 2 11 Jun 2007, 13:50
Display posts from previous: Sort by

x+y+z

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.