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

It is currently 20 Apr 2019, 19:40

Close

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
Your Progress

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.

Close

Request Expert Reply

Confirm Cancel

If the symbol § represents one of the following operations:

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

Hide Tags

 
Intern
Intern
avatar
Joined: 03 Sep 2013
Posts: 1
If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 06 Oct 2013, 11:12
2
9
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

52% (01:37) correct 48% (01:49) wrong based on 255 sessions

HideShow timer Statistics

If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 54376
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 06 Oct 2013, 11:19
3
1
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 54376
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 06 Oct 2013, 11:20
2
1
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.


Similar questions to practice:
if-represents-one-of-the-operations-and-x-is-k-l-m-144138.html
if-denotes-one-of-two-arithmetic-operations-addition-or-50178.html
if-the-symbol-represents-either-addition-or-multiplication-104600.html
if-the-operation-is-one-of-the-four-arithmetic-operations-101283.html
if-the-operation-is-one-of-the-four-arithmetic-operations-93966.html
if-denotes-one-of-the-four-arithmetic-operations-addition-105472.html
the-symbol-represents-one-of-the-four-arithmetic-operation-107575.html
if-the-symbol-represents-either-addition-subtraction-101741.html
if-the-symbol-represents-either-addition-or-multiplication-104600.html
if-represents-one-of-the-operations-and-is-a-101337.html
the-operation-x-n-for-all-positive-integers-greater-than-99064.html
if-represents-one-of-the-operations-and-x-is-k-l-m-144138.html

Hope it helps.
_________________
Manager
Manager
avatar
Joined: 05 Feb 2015
Posts: 51
Concentration: Finance, Entrepreneurship
Schools: ISB '16, IIMA , IIMB, IIMC
WE: Information Technology (Health Care)
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 07 May 2015, 10:10
Hi mattycen

1) is definitely insufficient because depending upon what the symbol denotes, the value would change.

2) -a * -b -> this would always be equal to -b * -a
-a + -b -> this equals -a -b or -b + -a
the only operation here is subtraction that could change the value of the given expression.
So, using this we can calculate the value of (x§2)§x
GMAT Tutor
User avatar
G
Status: Tutor - BrushMyQuant
Joined: 05 Apr 2011
Posts: 620
Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE: Information Technology (Computer Software)
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 18 Jul 2015, 13:59
mattycen wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.

Please move this to DS from PS. Thank you
_________________
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2624
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 18 Jul 2015, 15:51
nktdotgupta wrote:
mattycen wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.

Please move this to DS from PS. Thank you


Done. Thankyou for the information.
Intern
Intern
avatar
B
Joined: 10 Jun 2014
Posts: 18
GMAT ToolKit User
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 21 Sep 2016, 02:51
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.





x can be negative in that case answer B is not right one. Do u agree with that?
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 54376
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 21 Sep 2016, 03:09
azamaka wrote:
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.





x can be negative in that case answer B is not right one. Do u agree with that?


No, that's not right.

From (2) we know that § represents subtraction. We need to find the value of (x§2)§x, thus since § represents subtraction, the value of (x-2)-x. x there cancels out and we get that (x-2)-x=-2. Therefore we get that (x§2)§x = (x-2)-x=-2 irrespective of the value of x, positive or negative.

Hope it's clear.
_________________
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 10564
Re: If the symbol § represents one of the following operations:  [#permalink]

Show Tags

New post 29 Mar 2019, 08:43
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: If the symbol § represents one of the following operations:   [#permalink] 29 Mar 2019, 08:43
Display posts from previous: Sort by

If the symbol § represents one of the following operations:

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.