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

 It is currently 27 Mar 2015, 21:27

### 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 xy + z = x(y+z), which of the following must be true? A.

Author Message
TAGS:
Director
Joined: 01 May 2007
Posts: 794
Followers: 1

Kudos [?]: 115 [0], given: 0

If xy + z = x(y+z), which of the following must be true? A. [#permalink]  18 May 2008, 17:14
If xy + z = x(y+z), which of the following must be true?

A. x = 0 and z = 0
B. x = 1 and y = 1
C. y = 1 and z = 0
D. x = 1 OR y = 0
E. x = 1 OR z = 0

My bad, botch the data entry on this one....should have ORs.

Last edited by jimmyjamesdonkey on 18 May 2008, 18:15, edited 1 time in total.
Director
Joined: 23 Sep 2007
Posts: 797
Followers: 5

Kudos [?]: 95 [0], given: 0

Re: GMATPrep [#permalink]  18 May 2008, 17:18
jimmyjamesdonkey wrote:
If xy + z = x(y+z), which of the following must be true?

A. x = 0 and z = 0
B. x = 1 and y = 1
C. y = 1 and z = 0
D. x = 1 and y = 0
E. x = 1 and z = 0

xy + z = xy + xz ----> z = xz

the y is not important, so eliminate b,c,d

I think choice E should be "OR" instead of "AND"

E
SVP
Joined: 28 Dec 2005
Posts: 1583
Followers: 2

Kudos [?]: 85 [0], given: 2

Re: GMATPrep [#permalink]  18 May 2008, 17:48
why not B ?

if x=1 and y=1, then xy+z = 1+z and x(y+z) = xy+xz = 1 +z
Director
Joined: 23 Sep 2007
Posts: 797
Followers: 5

Kudos [?]: 95 [0], given: 0

Re: GMATPrep [#permalink]  18 May 2008, 17:56
pmenon wrote:
why not B ?

if x=1 and y=1, then xy+z = 1+z and x(y+z) = xy+xz = 1 +z

A, B, and E are all correct according to the answer choices.

BUT the original poster did not post the correct answer choices from the real test. There should some "OR"s in the answer choices.
Re: GMATPrep   [#permalink] 18 May 2008, 17:56
Similar topics Replies Last post
Similar
Topics:
11 If xy+z = x(y+z), which of the following must be true? 10 16 Sep 2009, 11:34
If xy+z = x(y+z), which of the following must be true? a. 4 30 Mar 2008, 23:36
If xy + z = x(y+z), which of the following must be true? A. 2 23 Dec 2007, 20:47
If xy+z = x(y+z), which of the following must be true? 1, 2 09 Dec 2007, 19:08
If xy +z = x(y+z) which of the following must be true? A) 3 05 Nov 2006, 16:11
Display posts from previous: Sort by