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

It is currently 21 Sep 2018, 12:46

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

2^x*4^(2x)=8^y. Which of the following must be true?

  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: 49300
2^x*4^(2x)=8^y. Which of the following must be true?  [#permalink]

Show Tags

New post 22 Feb 2017, 03:40
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

90% (00:47) correct 10% (00:47) wrong based on 40 sessions

HideShow timer Statistics

Manager
Manager
avatar
S
Joined: 05 Apr 2014
Posts: 141
Location: India
Concentration: Economics, International Business
Schools: ISB '19, Fox"19
GMAT 1: 660 Q48 V33
GPA: 3
Re: 2^x*4^(2x)=8^y. Which of the following must be true?  [#permalink]

Show Tags

New post 22 Feb 2017, 04:52
D
2^x * 2^4x = 2^3y
Gives 5x= 3y

Sent from my SM-G600FY using GMAT Club Forum mobile app
Manager
Manager
avatar
S
Joined: 13 Apr 2010
Posts: 90
Reviews Badge
Re: 2^x*4^(2x)=8^y. Which of the following must be true?  [#permalink]

Show Tags

New post 22 Feb 2017, 05:13
Bunuel wrote:
\(2^x*4^{(2x)}=8^y\). Which of the following must be true?

A. 3x=y

B. x=3y

C. y=3/5*x

D. x=3/5*y

E. 2x^2=y


\(2^x . 2^{(4x)} = 2^{(3y)}\)
\(2^{(5x)} = 2^{(3y)}\)
5x = 3y
x = 3/5. y

Answer is D .
Re: 2^x*4^(2x)=8^y. Which of the following must be true? &nbs [#permalink] 22 Feb 2017, 05:13
Display posts from previous: Sort by

2^x*4^(2x)=8^y. Which of the following must be true?

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

Events & Promotions

PREV
NEXT


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®.