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

It is currently 14 Dec 2018, 02:04

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
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar

If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51214
If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 01 Aug 2018, 23:01
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:28) correct 21% (02:08) wrong based on 61 sessions

HideShow timer Statistics

Senior Manager
Senior Manager
User avatar
S
Joined: 21 Jan 2015
Posts: 355
Location: India
Concentration: Strategy, Marketing
GMAT 1: 620 Q48 V28
GMAT 2: 690 Q49 V35
WE: Sales (Consumer Products)
GMAT ToolKit User CAT Tests
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 01 Aug 2018, 23:17
Ans: C

from given equations: -12b-2a =10b+80
-22b -2a =80 OR -11b-a = 40 ......(1)
& 9a-b=10b+80 9a-11b= 80 ........(2)
so from these two we get a =4 and b =-4 so 11a+11b = 0

Bunuel wrote:
If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

A. -4
B. -2
C. 0
D. 2
E. 4

_________________

--------------------------------------------------------------------
The Mind is Everything, What we Think we Become.

Director
Director
User avatar
P
Joined: 31 Oct 2013
Posts: 876
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 01 Aug 2018, 23:40
Bunuel wrote:
If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

A. -4
B. -2
C. 0
D. 2
E. 4



9a - b = -12b - 2a

11 a = -11 b

a = -b .

Question:

11a + 11b

= 11(-b) + 11 b

= 0

The best answer is C.
SC Moderator
User avatar
P
Joined: 30 Jan 2015
Posts: 667
Location: India
Concentration: Operations, Marketing
GPA: 3.5
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 02 Aug 2018, 00:50
Bunuel wrote:
If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

9a - b = -12b - 2a (Given)
9a + 2a = -12b + b
11a = -11b
11a + 11b = 0

Hence, C.
_________________

The few, the fearless !

Thanks :-)

Intern
Intern
avatar
B
Joined: 04 May 2018
Posts: 2
Location: Saudi Arabia
GPA: 3.9
GMAT ToolKit User CAT Tests
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 02 Aug 2018, 22:39
9a - b = 10b + 80 = -12b - 2a

then 11a + 11b = ?

1. Look for the equation which will solve for either 11a and 11b or ( a and b )

2. 9a - b = -12b - 2a suffice one of the above

3. Solving this, we get 11a = -11b

4. ie, 11a+11b = 0

hence the answer D
Director
Director
User avatar
G
Joined: 04 Sep 2015
Posts: 520
Location: India
WE: Information Technology (Computer Software)
Premium Member Reviews Badge CAT Tests
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?  [#permalink]

Show Tags

New post 09 Aug 2018, 03:34
9a - b = 10b + 80 = -12b - 2a,

form the above we use the first and the last part,

9a-b =-12b-2a.
from this we get 11a=-11b, thus 11a+11b =0. solved
GMAT Club Bot
Re: If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b? &nbs [#permalink] 09 Aug 2018, 03:34
Display posts from previous: Sort by

If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

  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®.