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# GMAT Prep - Prob #2

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Intern
Joined: 29 Dec 2006
Posts: 32

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

GMAT Prep - Prob #2 [#permalink]

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14 Apr 2009, 15:16
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:37) correct 0% (00:00) wrong based on 0 sessions

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if xy+z=x(y+z), which of the following must be true:
a. x=0 & z=0
b. x=1 & y=1
c. y=1 & z=0
d. x=1 or y=0
e. x=1 or z=0

i feel that it can be a, c, or e....

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Intern
Joined: 09 Apr 2009
Posts: 7

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

Re: GMAT Prep - Prob #2 [#permalink]

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14 Apr 2009, 16:14
xy+z=x(y+z)
expand: xy + z = xy + xz
minus xy on both sides: z = xz

Therefore E. I'm not really sure about it though.

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Senior Manager
Joined: 08 Jan 2009
Posts: 326

Kudos [?]: 176 [0], given: 5

Re: GMAT Prep - Prob #2 [#permalink]

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14 Apr 2009, 19:43
Agree with E.

(xz -z) = 0 z( x-1) = 0

z= 0 or X = 1

Kudos [?]: 176 [0], given: 5

Intern
Joined: 29 Dec 2006
Posts: 32

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

Re: GMAT Prep - Prob #2 [#permalink]

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14 Apr 2009, 20:08
makes sense. thanks!

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Re: GMAT Prep - Prob #2   [#permalink] 14 Apr 2009, 20:08
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