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

It is currently 18 Apr 2014, 12:53

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 and y are positive integers and 1 + x + y + xy = 15,

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
VP
VP
User avatar
Joined: 06 Feb 2007
Posts: 1024
Followers: 17

Kudos [?]: 91 [0], given: 0

GMAT Tests User Reviews Badge
If x and y are positive integers and 1 + x + y + xy = 15, [#permalink] New post 23 Jul 2007, 12:52
If x and y are positive integers and 1 + x + y + xy = 15, what is the value of x + y?

A. 3
B. 5
C. 6
D. 8
E. 9

Please provide your explanations.
Senior Manager
Senior Manager
User avatar
Joined: 17 Jul 2007
Posts: 289
Location: The 408
Followers: 3

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

GMAT Tests User
 [#permalink] New post 23 Jul 2007, 13:03
isolate variables on the right so:

x+y+xy=14

only two numbers that fit this (2 and 4)

so isolating what it asks for (xy) we get answer D
Current Student
Joined: 28 Dec 2004
Posts: 3411
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 148 [0], given: 2

GMAT Tests User
 [#permalink] New post 23 Jul 2007, 13:17
it should be C; its asking for X+Y (4+2)=6 :)
Senior Manager
Senior Manager
User avatar
Joined: 17 Jul 2007
Posts: 289
Location: The 408
Followers: 3

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

GMAT Tests User
 [#permalink] New post 23 Jul 2007, 13:43
fresinha12 wrote:
it should be C; its asking for X+Y (4+2)=6 :)


dang it. :oops: now would be a good time to state my RC isn't quite where I need it to be :lol:
Manager
Manager
User avatar
Joined: 22 May 2007
Posts: 122
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink] New post 23 Jul 2007, 13:48
dang it me too :)
VP
VP
User avatar
Joined: 06 Feb 2007
Posts: 1024
Followers: 17

Kudos [?]: 91 [0], given: 0

GMAT Tests User Reviews Badge
 [#permalink] New post 23 Jul 2007, 15:13
The OA is C
Thanks, guys!
Senior Manager
Senior Manager
User avatar
Joined: 28 Jun 2007
Posts: 464
Followers: 2

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 23 Jul 2007, 15:24
1+x+y+xy = (1+x)(1+y) =15
3*5 = 15 => x,y = {2,4}

Ans : 6
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5099
Location: Singapore
Followers: 15

Kudos [?]: 120 [0], given: 0

GMAT Tests User
 [#permalink] New post 23 Jul 2007, 18:25
1+x+y+xy = (1+x) + y(1+x) = (1+x)(1+y) = 15

Cannot be (1,15) because x would not be positive
Must be (3,5), then x = 2, y = 4, then x+y = 6
  [#permalink] 23 Jul 2007, 18:25
    Similar topics Author Replies Last post
Similar
Topics:
New posts If x and y are positive integers and 1 + x + y + xy = 15, topkool 3 01 Dec 2006, 06:26
New posts If x and y are positive integers and 1 + x + y + xy = 15, goalsnr 1 01 Jun 2008, 12:12
New posts If x and y are positive integers and 1 + x + y + xy = 15, mrwaxy 3 12 Jun 2008, 03:45
New posts 3 If x and y are positive integers and 1 + x + y + xy = 15, quantum 2 19 Jun 2008, 07:46
New posts 2 If x and y are positive integers and 1 + x + y + xy = 15, rnemani 4 08 Oct 2008, 10:06
Display posts from previous: Sort by

If x and y are positive integers and 1 + x + y + xy = 15,

  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®.