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

 It is currently 18 Oct 2019, 21:52 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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  M23-37

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 58453

Show Tags 00:00

Difficulty:   5% (low)

Question Stats: 84% (01:07) correct 16% (01:01) wrong based on 111 sessions

HideShow timer Statistics

x 2 1

2 1 y

1 z 2

If in this table above $$x$$, $$y$$, and $$z$$ stand for numbers, what is the value of $$x + y + z$$ ?

(1) The sum of numbers in each of the rows is equal.

(2) The sum of numbers in each of the columns is equal.

_________________
Math Expert V
Joined: 02 Sep 2009
Posts: 58453

Show Tags

Official Solution:

(1) The sum of numbers in each of the rows is equal. So, $$x+2+1=2+1+y=1+z+2$$, which gives that $$x=y=z$$. Not sufficient.

(2) The sum of numbers in each of the columns is equal. So, $$x+2+1=2+1+z=1+y+2$$, which again gives that $$x=y=z$$. Not sufficient.

(1)+(2) All we know is that $$x=y=z$$, which is not sufficient to get the value of $$x+y+z$$. Not sufficient.

_________________
Manager  S
Joined: 12 Mar 2015
Posts: 52
Location: United States
GMAT 1: 670 Q45 V38 GPA: 2.99
WE: Corporate Finance (Aerospace and Defense)

Show Tags

i thought this question was fair and good.
Intern  B
Joined: 18 Mar 2017
Posts: 25

Show Tags

Where it is mentioned that x, y and z should be distinct numbers?
Math Expert V
Joined: 02 Sep 2009
Posts: 58453

Show Tags

mchoudh7 wrote:
Where it is mentioned that x, y and z should be distinct numbers?

It is not mentioned. If nothing is mentioned, then variables can represent distinct numbers as well as the same number.
_________________
Retired Moderator P
Joined: 19 Mar 2014
Posts: 922
Location: India
Concentration: Finance, Entrepreneurship
GPA: 3.5

Show Tags

Bunuel wrote:
x 2 1

2 1 y

1 z 2

If in this table above $$x$$, $$y$$, and $$z$$ stand for numbers, what is the value of $$x + y + z$$ ?

(1) The sum of numbers in each of the rows is equal.

(2) The sum of numbers in each of the columns is equal.

(1) The sum of numbers in each of the rows is equal

This does not give us the values of x, y and z, only gives information of $$x =y = z$$, which is not sufficient to get the values of $$x+y+z$$ as x, y and z can be any number and hence values will change.

Hence, (1) =====> is NOT SUFFICIENT

(2) The sum of numbers in each of the columns is equal

Once again, this does not give us the values of x, y and z, only gives information of $$x =y = z$$, which is not sufficient to get the values of $$x+y+z$$ as x, y and z can be any number and hence values will change.

Hence, (2) =====> is NOT SUFFICIENT

Combining (1) & (2)

Even after combing we will know that x = y = z, and as the values are not provided we will not be able to find the value of $$x + y + z$$

(1) & (2) =====> is NOT SUFFICIENT

Hence, Answer is E
_________________
"Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent."

Best AWA Template: https://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html#p470475
Senior Manager  S
Joined: 08 Jun 2015
Posts: 420
Location: India
GMAT 1: 640 Q48 V29 GMAT 2: 700 Q48 V38 GPA: 3.33

Show Tags

+1 for option E.

Statement 1 : We get x=y=z ; NS
Statement 2 : We get x=y=z ; NS

Both together : No additional info ! ; NS

Hence option E.
_________________
" The few , the fearless "
Intern  B
Joined: 21 Oct 2018
Posts: 32
Location: India

Show Tags

mchoudh7 wrote:
Where it is mentioned that x, y and z should be distinct numbers?

You true man! it is not mentioned anywhere , consider

X=y=z=2 then value of x+y+z =6

if , x=y=z=3 then value of x+y+z=9

clearly we are getting different answer each time
Intern  B
Joined: 05 Sep 2018
Posts: 7

Show Tags

Yes, its not mentioned in the question that XYZ have a distinct from each other. Why should we take this as an assumption that they cant be equal to each other. Can anybody please explain ?
Intern  S
Joined: 10 Mar 2018
Posts: 41
Location: India
Concentration: Entrepreneurship, Marketing
WE: Design (Retail)

Show Tags

anshuliitd wrote:
Yes, its not mentioned in the question that XYZ have a distinct from each other. Why should we take this as an assumption that they cant be equal to each other. Can anybody please explain ?

From Statement (1) and from Statement (2) we are getting that x=y=z

we are not assuming anywhere that they can not be equal.
_________________
~ETERNAL~ Re: M23-37   [#permalink] 14 Oct 2019, 12:26
Display posts from previous: Sort by

M23-37

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

Moderators: chetan2u, Bunuel

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne  