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

It is currently 29 Aug 2014, 06:23

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

if X^2=y+5 , y=z-2 , z=2x Is x^3 + y^2 +z divisible by 7 a)

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
if X^2=y+5 , y=z-2 , z=2x Is x^3 + y^2 +z divisible by 7 a) [#permalink] New post 13 Sep 2007, 13:36
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
if X^2=y+5 , y=z-2 , z=2x
Is x^3 + y^2 +z divisible by 7

a) x>0
b) y=4
VP
VP
User avatar
Joined: 08 Jun 2005
Posts: 1157
Followers: 6

Kudos [?]: 110 [0], given: 0

GMAT Tests User
 [#permalink] New post 13 Sep 2007, 14:19
Is x^3 + y^2 +z divisible by 7 ?

x^2=y+5 , y=z-2 , z=2x

Statement 1

y = 2x-2

x^2 = 2x-2+5

x^2 = 2x+3

since x > 0 the only solution for this equation is x=3

3^2 = 2*3 + 3

x = 3, z = 6, y = 4

sufficient

Statement 2

Edited - see b14kumar post !

y = 4

we can solve for z = 6

x has to be x = 3

3^3 + 4^2 + 6 = 49/7 ---> true

sufficient

the answer is (D)

:)

Last edited by KillerSquirrel on 13 Sep 2007, 22:49, edited 1 time in total.
Director
Director
avatar
Joined: 17 Sep 2005
Posts: 931
Followers: 2

Kudos [?]: 22 [0], given: 0

GMAT Tests User
Re: DS-tricky [#permalink] New post 13 Sep 2007, 21:00
fresinha12 wrote:
if X^2=y+5 , y=z-2 , z=2x
Is x^3 + y^2 +z divisible by 7

a) x>0
b) y=4


I think, it's D.

Each of the options is sufficient.

If we solve the given equation then we will have two sets of the values of x,y and z.

Set1 = {x=-1, y= -4 , z= -2}
Set2 = {x=3, y= 4 , z= 6}

Stm1: x>0

Then x = 3 and hence, y=4 and z=6.
=> x^3 + y^2 +z = 49 which is divisible by 7

Stm2: y=4

Then from set2, x=3 and z=6
=> x^3 + y^2 +z = 49 which is divisible by 7

Hence D.

- Brajesh
VP
VP
User avatar
Joined: 08 Jun 2005
Posts: 1157
Followers: 6

Kudos [?]: 110 [0], given: 0

GMAT Tests User
Re: DS-tricky [#permalink] New post 13 Sep 2007, 21:05
b14kumar wrote:
fresinha12 wrote:
if X^2=y+5 , y=z-2 , z=2x
Is x^3 + y^2 +z divisible by 7

a) x>0
b) y=4


I think, it's D.

Each of the options is sufficient.

If we solve the given equation then we will have two sets of the values of x,y and z.

Set1 = {x=-1, y= -4 , z= -2}
Set2 = {x=3, y= 4 , z= 6}

Stm1: x>0

Then x = 3 and hence, y=4 and z=6.
=> x^3 + y^2 +z = 49 which is divisible by 7

Stm2: y=4

Then from set2, x=3 and z=6
=> x^3 + y^2 +z = 49 which is divisible by 7

Hence D.

- Brajesh


I agree - good catch !

:)
VP
VP
User avatar
Joined: 08 Jun 2005
Posts: 1157
Followers: 6

Kudos [?]: 110 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Sep 2007, 12:49
fresinha12 wrote:
OA is D


Thanks

:)
Senior Manager
Senior Manager
User avatar
Joined: 27 Aug 2007
Posts: 255
Followers: 1

Kudos [?]: 8 [0], given: 0

GMAT Tests User
 [#permalink] New post 15 Sep 2007, 07:45
It is D,

If everything solved before going into 1 and 2, it will be clear that both of them sufficient.

Ans: D
  [#permalink] 15 Sep 2007, 07:45
    Similar topics Author Replies Last post
Similar
Topics:
6 Experts publish their posts in the topic If x^2 = y + 5, y = z - 2 and z = 2x, is x^3 + y^2 + z keiraria 2 29 Apr 2012, 01:29
8 Experts publish their posts in the topic If x^2 = y + 5 , y = z - 2 and z = 2x , is x^3 + y^2 + z study 11 13 Jun 2010, 08:11
1) x^2 + y^2 > Z^2 X^2, Y^2, Z^2 are always positive Aleehsgonji 6 23 Jul 2009, 19:29
Is 5|x| = y 2z? 1. 5x + y = 2z 2. x < 0 seofah 5 07 Jun 2009, 00:35
if X^2=y+5 , y=z-2 , z=2x Is x^3 + y^2 +z divisible by 7 a) saurabhmalpani 7 02 May 2007, 16:37
Display posts from previous: Sort by

if X^2=y+5 , y=z-2 , z=2x Is x^3 + y^2 +z divisible by 7 a)

  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®.