GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 Jan 2019, 12:07

### 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 January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### GMAT Club Tests are Free & Open for Martin Luther King Jr.'s Birthday!

January 21, 2019

January 21, 2019

10:00 PM PST

11:00 PM PST

Mark your calendars - All GMAT Club Tests are free and open January 21st for celebrate Martin Luther King Jr.'s Birthday.
• ### The winners of the GMAT game show

January 22, 2019

January 22, 2019

10:00 PM PST

11:00 PM PST

In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.

# 2x+2y=6z, 2x-2y=2z and y-z=0

Author Message
Director
Joined: 31 Oct 2013
Posts: 976
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)

### Show Tags

28 Jan 2018, 02:24
1
00:00

Difficulty:

85% (hard)

Question Stats:

14% (01:31) correct 86% (00:47) wrong based on 37 sessions

### HideShow timer Statistics

2x+2y=6z, 2x-2y=2z and y-z=0, how many unique solutions are there for y?

a)1
b)2
c)3
d)4
e) none of these

looking for easiest ways to deal with this typ question?

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Intern
Joined: 04 Jan 2018
Posts: 37
Re: 2x+2y=6z, 2x-2y=2z and y-z=0  [#permalink]

### Show Tags

28 Jan 2018, 05:14
2
1
selim wrote:
2x+2y=6z, 2x-2y=2z and y-z=0, how many unique solutions are there for y?

a)1
b)2
c)3
d)4
e) none of these

looking for easiest ways to deal with this typ question?

Infinite solutions actually.

let 2x+2y=6z-------------------(1)

2x-2y=2z-----------------------(2)

y=z------------------------------(3)

(1) + (2) =====> x=2z --------(4)

from 3 n 4 we can conclude that all the values are dependent on Z

So infinite unique values of y.

--------------------------------------------------------
Dont stop till you get enough

Hit kudos if it helped you.
_________________

Don't stop till you get enough

Hit kudos if it helped you.

Intern
Joined: 22 Jan 2018
Posts: 5
Re: 2x+2y=6z, 2x-2y=2z and y-z=0  [#permalink]

### Show Tags

30 Jan 2018, 01:01
selim wrote:
2x+2y=6z, 2x-2y=2z and y-z=0, how many unique solutions are there for y?

a)1
b)2
c)3
d)4
e) none of these

looking for easiest ways to deal with this typ question?

why should the solution be b?
the answer offers infinte solutions, since x=2z and y=z

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: 2x+2y=6z, 2x-2y=2z and y-z=0 &nbs [#permalink] 30 Jan 2018, 01:01
Display posts from previous: Sort by