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

 It is currently 28 Aug 2014, 21:28

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If X^2*Y^3=200, what is xy? 1. y is an integer 2. X/Y=2.5

Author Message
TAGS:
VP
Joined: 22 Nov 2007
Posts: 1102
Followers: 6

Kudos [?]: 118 [0], given: 0

If X^2*Y^3=200, what is xy? 1. y is an integer 2. X/Y=2.5 [#permalink]  24 Feb 2008, 11:46
If X^2*Y^3=200, what is xy?
1. y is an integer
2. X/Y=2.5
Current Student
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

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

Re: exponents [#permalink]  24 Feb 2008, 21:11
I get B as well..

x^2y^3=200

well if x=1 then y^3 or y=cuberoot(200) etc

1) if y is integer, i.e 1 then x=sqrt(200) etc or y^3=2^3 or x^2=5^2 xy=10

insuff

2) x/y=2.5 well only x=5 and y=2 fits the bill..

xy=10 sufficient
CEO
Joined: 29 Mar 2007
Posts: 2593
Followers: 16

Kudos [?]: 186 [0], given: 0

Re: exponents [#permalink]  27 Feb 2008, 07:27
marcodonzelli wrote:
If X^2*Y^3=200, what is xy?
1. y is an integer
2. X/Y=2.5

200--> 5^2*2^3

1: we don't know wheter x is + or -. insuff

2: must be 5/2. we know that both must be +. So suff.
Re: exponents   [#permalink] 27 Feb 2008, 07:27
Similar topics Replies Last post
Similar
Topics:
2 If x and y are nonnegative integers and x+y=25 what is x? 6 12 Feb 2012, 01:21
3 If X and Y are prime integers, what is X+Y? 1. X-Y is a 5 29 Jul 2010, 12:35
if x+y^2 = (x+y^2)^2 whats is the value of y? 1)x=y^2 4 31 Aug 2008, 18:27
Are X and Y intergers? 1. x*y is an integer. 2. X+y is an 7 28 Jan 2006, 06:01
If x+y^2=(x+y^2)^2 What si the value of y? 1) x=y^2 2) 1 09 Dec 2005, 07:37
Display posts from previous: Sort by