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

It is currently 27 Aug 2014, 17:18

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^3(y^4)=2000 What is y? 1. X is an integer 2. Y is an

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
CEO
CEO
User avatar
Joined: 21 Jan 2007
Posts: 2770
Location: New York City
Followers: 6

Kudos [?]: 215 [0], given: 4

GMAT Tests User
x^3(y^4)=2000 What is y? 1. X is an integer 2. Y is an [#permalink] New post 26 Nov 2007, 14:06
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 357

Kudos [?]: 1749 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
 [#permalink] New post 26 Nov 2007, 14:16
Expert's post
E.

(x^3)*(y^4)=2000

it is obviously that y<>0 and y=+/-|y| for any X and Y.
so 1,2,1&2 - INSUFF

(for 1&2 y=+/-2)
CEO
CEO
User avatar
Joined: 29 Aug 2007
Posts: 2501
Followers: 53

Kudos [?]: 500 [0], given: 19

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 26 Nov 2007, 14:17
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?


since x and y both are integers, factorization would be useful.

2000 = 2x2x2x2x5x5x5

so, y should be 2.
CEO
CEO
User avatar
Joined: 29 Mar 2007
Posts: 2593
Followers: 16

Kudos [?]: 185 [0], given: 0

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 26 Nov 2007, 16:25
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?



x^3y^4=2*2^3*5^3 ---> x^3*y^4=2^4*5^3.

Now X and y could be non integers so we cant say for certain y^4=2^4.

S1: X=integer. X could be 1 and y^4 could equal the 4th root of 2000. insuff. Or x can be 5 and Y 2

S2: Same thing Y could be 1 or 2.


Together we cannot have either as the 4throot of 2000. So Y must be 2


Suff.


C
VP
VP
User avatar
Joined: 09 Jul 2007
Posts: 1111
Location: London
Followers: 6

Kudos [?]: 63 [0], given: 0

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 26 Nov 2007, 16:37
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?


E. i guess.
even we say C then
y=+-2
x=5
Director
Director
avatar
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 12 [0], given: 0

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 26 Nov 2007, 17:07
got caught here too,

GMATBLACKBELT wrote:
Ravshonbek wrote:
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?


E. i guess.
even we say C then
y=+-2
x=5



arghhhh!!!!


E it is
Senior Manager
Senior Manager
avatar
Joined: 06 Aug 2007
Posts: 370
Followers: 1

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

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 26 Nov 2007, 19:34
Ravshonbek wrote:
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?


E. i guess.
even we say C then
y=+-2
x=5


Good point ...I was going with C..
CEO
CEO
User avatar
Joined: 21 Jan 2007
Posts: 2770
Location: New York City
Followers: 6

Kudos [?]: 215 [0], given: 4

GMAT Tests User
Re: x^3(y^4)=2000 [#permalink] New post 29 Nov 2007, 09:00
GMATBLACKBELT wrote:
bmwhype2 wrote:
x^3(y^4)=2000
What is y?

1. X is an integer
2. Y is an integer

How do i approach this question?



x^3y^4=2*2^3*5^3 ---> x^3*y^4=2^4*5^3.

Now X and y could be non integers so we cant say for certain y^4=2^4.

S1: X=integer. X could be 1 and y^4 could equal the 4th root of 2000. insuff. Or x can be 5 and Y 2

S2: Same thing Y could be 1 or 2.


Together we cannot have either as the 4throot of 2000. So Y must be 2


Suff.


C
.

thanks for laying out the answer.

y^4 ==> even exponent hides the sign of the base.
OA is E
Re: x^3(y^4)=2000   [#permalink] 29 Nov 2007, 09:00
    Similar topics Author Replies Last post
Similar
Topics:
6 Experts publish their posts in the topic If y = (5-x)^1/2 where x and y are integers, what is the MacFauz 3 11 Dec 2012, 03:23
If x and y are positive integers and y=(9-x)^1/2, what is puma 7 06 May 2008, 11:01
If X^2*Y^3=200, what is xy? 1. y is an integer 2. X/Y=2.5 marcodonzelli 2 24 Feb 2008, 11:46
X and Y are integers. Is Y an even integer? (1) Y^2 + X = bkk145 6 25 Oct 2007, 14:12
y is odd, x^3*y^4=5000, what is y? 1) x is integer 2) y > gamjatang 2 28 Oct 2005, 05:35
Display posts from previous: Sort by

x^3(y^4)=2000 What is y? 1. X is an integer 2. Y is an

  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®.