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

It is currently 20 Nov 2018, 08:35

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 November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • All GMAT Club Tests are Free and open on November 22nd in celebration of Thanksgiving Day!

     November 22, 2018

     November 22, 2018

     10:00 PM PST

     11:00 PM PST

    Mark your calendars - All GMAT Club Tests are free and open November 22nd to celebrate Thanksgiving Day! Access will be available from 0:01 AM to 11:59 PM, Pacific Time (USA)
  • Free lesson on number properties

     November 23, 2018

     November 23, 2018

     10:00 PM PST

     11:00 PM PST

    Practice the one most important Quant section - Integer properties, and rapidly improve your skills.

M61-18

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

Hide Tags

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6529
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
M61-18  [#permalink]

Show Tags

New post 18 Jun 2018, 04:04
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

88% (01:40) correct 13% (02:56) wrong based on 8 sessions

HideShow timer Statistics

If \(2^n+2^{n-2}=5120\), then \(n=?\)


A. 8
B. 9
C. 10
D. 11
E. 12

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6529
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re M61-18  [#permalink]

Show Tags

New post 18 Jun 2018, 04:04
Official Solution:


If \(2^n+2^{n-2}=5120\), then \(n=?\)


A. 8
B. 9
C. 10
D. 11
E. 12


Factoring yields

\(2^{n}+2^{n-2}=2^{2}2^{n-2}+2^{n-2}=(2^2+1)2^{n-2}=5*2^{n-2}=5120=5*1024\).

Therefore, \(2^{n-2}=1024=2^{10}\) and \(n-2 = 10\). It follows that \(n = 12\).


Answer: E
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Intern
Intern
avatar
B
Joined: 14 Jun 2018
Posts: 47
Location: India
Concentration: International Business, Marketing
Re: M61-18  [#permalink]

Show Tags

New post 14 Sep 2018, 05:08
MathRevolution wrote:
If \(2^n+2^{n-2}=5120\), then \(n=?\)


A. 8
B. 9
C. 10
D. 11
E. 12


Hello Can anyone please explain this question in a simpler manner? it would be of great help. Thank you!
Intern
Intern
avatar
B
Joined: 08 Aug 2018
Posts: 3
Re: M61-18  [#permalink]

Show Tags

New post 25 Oct 2018, 03:43
I agree with Shri15kumar. The explanation is not clear. I got the answer correct but only because I guessed and I would really like to learn how to solve a problem like this. Thank you!
GMAT Club Bot
Re: M61-18 &nbs [#permalink] 25 Oct 2018, 03:43
Display posts from previous: Sort by

M61-18

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

Moderators: chetan2u, Bunuel



cron
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®.