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

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Director
Director
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Joined: 29 Aug 2005
Posts: 855

Kudos [?]: 489 [0], given: 7

If x and y are positive integers and 1 + x + y + xy = 15, [#permalink]

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New post 23 Nov 2008, 05:59
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 489 [0], given: 7

Intern
Intern
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Joined: 21 Nov 2008
Posts: 4

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

Re: GMAT Set 27 - 3 [#permalink]

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New post 23 Nov 2008, 07:04
C: 6
2 & 4 for x & y will suffice

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

Director
Director
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Joined: 29 Aug 2005
Posts: 855

Kudos [?]: 489 [0], given: 7

Re: GMAT Set 27 - 3 [#permalink]

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New post 23 Nov 2008, 08:34
sapnaprakash wrote:
C: 6
2 & 4 for x & y will suffice

Yes, OA C. But Is there more constructive way of solving it?

Kudos [?]: 489 [0], given: 7

Manager
Manager
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Joined: 05 Jul 2008
Posts: 136

Kudos [?]: 123 [0], given: 40

GMAT 2: 740 Q51 V38
Re: GMAT Set 27 - 3 [#permalink]

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New post 23 Nov 2008, 09:48
botirvoy wrote:
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

(x+1)(y+1)=15
while x+1 and y+1 are integers so
x+1=3
y+1=5

Kudos [?]: 123 [0], given: 40

Director
Director
avatar
Joined: 29 Aug 2005
Posts: 855

Kudos [?]: 489 [0], given: 7

Re: GMAT Set 27 - 3 [#permalink]

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New post 30 Nov 2008, 11:36
Thanks for answers. OA C

Kudos [?]: 489 [0], given: 7

Re: GMAT Set 27 - 3   [#permalink] 30 Nov 2008, 11:36
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If x and y are positive integers and 1 + x + y + xy = 15,

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