Find all School-related info fast with the new School-Specific MBA Forum

It is currently 23 Oct 2014, 05:30

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

GMAT Diagnostic Test Question 5

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 19 Jul 2010
Posts: 16
Followers: 0

Kudos [?]: 1 [0], given: 7

Re: GMAT Diagnostic Test Question 5 [#permalink] New post 11 Sep 2010, 15:09
the way I broke numbers down:
999^36 = approx 1000^36
10^36 = 1000^12
777^36< 1000^36
20^24 = 10^24*2^24 =10^24*2^24*2^24 < 10^24*2^12*5^12(A)
(SQRT15)40 = 15^20=3^20*5^20 < 5^36*2^36 (A)
HENSE A IS AN ANSWER.
Intern
Intern
avatar
Joined: 13 Oct 2011
Posts: 17
Followers: 0

Kudos [?]: 7 [0], given: 16

GMAT ToolKit User Reviews Badge
Re: GMAT Diagnostic Test Question 5 [#permalink] New post 15 Feb 2012, 20:44
on gmat are answers displayed by increasing value?
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23393
Followers: 3609

Kudos [?]: 28828 [0], given: 2852

Re: GMAT Diagnostic Test Question 5 [#permalink] New post 16 Feb 2012, 02:50
Expert's post
shawndx wrote:
on gmat are answers displayed by increasing value?


Usually the answer choices in PS are in increasing or decreasing order. But not always, and certainly not for a question such as this one where we should find the greatest value.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 30 May 2008
Posts: 76
Followers: 0

Kudos [?]: 14 [0], given: 26

Re: GMAT Diagnostic Test Question 5 [#permalink] New post 03 Apr 2012, 20:34
how did you get from 2^24 to 2^4 * 10^6?
Intern
Intern
avatar
Joined: 10 Jun 2012
Posts: 6
GMAT 1: 640 Q48 V31
GMAT 2: 690 Q47 V38
Followers: 0

Kudos [?]: 2 [0], given: 0

Re: GMAT Diagnostic Test Question 5 [#permalink] New post 10 Jun 2012, 22:11
Hi, I'm new to the forum and currently prepping for the GMAT.

For this problem I manipulated all the answers in a similar way but I wanted to focus on the two answer choices that I was left with. I actually manipulated the answer choice D in a different manner and wanted to see if the method was okay. The bold is what I'm speaking about.

A - 999^12 -> 1000^12 -> (10^3)^12 -> 10^36

and

D - (-20)^24 -> ((-2)^24)*(10^24)..here is where I did it differently -> (((-2)^3)^8)*(10^24), which then becomes ((-8)^8)*(10^24).

From here I rounded down (-8)^8 to (-10)^8 and then dropped the negative sign because it becomes positive due to the even power.
My answer then looked like this: (10^8)*(10^24) -> 10^(8+24) = 10^32

From here, 10^36 > 10^32, therefore the answer is A.
Intern
Intern
User avatar
Status: Trying to crack GMAT
Joined: 17 May 2012
Posts: 39
Location: India
Concentration: Operations, Technology
GMAT Date: 07-11-2012
GPA: 3.82
WE: Engineering (Computer Software)
Followers: 0

Kudos [?]: 7 [0], given: 4

Re: GMAT Diagnostic Test Question 5 [#permalink] New post 20 Jun 2012, 08:56
Ok..i kinda get the concept.

So, can I safely assume that 2^3==10 and so, 2^24==10^3 and then discard D?

And, can we use this form for other questions as well? Ofcourse, in PS questions only (strictly speaking)
_________________

“When I was young I observed that nine out of ten things I did were failures, so I did ten times more work.” ~ Bernard Shaw


Kudos me if I helped you in any way.

Senior Manager
Senior Manager
User avatar
Joined: 17 Sep 2013
Posts: 311
Location: United States
Concentration: Marketing, Strategy
GMAT Date: 04-30-2014
GPA: 3.24
WE: Analyst (Consulting)
Followers: 4

Kudos [?]: 35 [0], given: 116

GMAT ToolKit User Premium Member CAT Tests
GMAT Diagnostic Test Question 5 [#permalink] New post 20 Jun 2014, 02:49
I am not sure how many of you might find this useful..but for Asian students familiar with log function...it might help

A. 999^12= 10^36=> 36 log 10 =>36

D. 20^24= As 20 is less than 3^3..thus 20^24 < 27^24 => 3^42 => 42 log 3 => 42 x 0.47 = Approx. 20

E. 15^20 < 2 ^80 => 80 log 2 = 80 x 0.3 = 24

Log values have a direct correlation with numerical value of the number...
I had learnt the values of log 3= .4771 and log 2= 0.3010 in my school days... surprisingly I was able to accurately retrieve these from my memory slot
Additionally log 1 = 0, log 10 = 1, log 100 = 2...(I guess)

I would be glad if Bunuel or Karishma validate my approach...Just to make things more clear
_________________

Appreciate the efforts...KUDOS for all

GMAT Diagnostic Test Question 5   [#permalink] 20 Jun 2014, 02:49
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic GMAT Club Verbal Diagnostic test No 5 Question Directory. daagh 2 24 Feb 2014, 06:48
1 Experts publish their posts in the topic A closed cylindrical tank contains 36π cubic feet of water GMATSA 5 06 Jul 2010, 19:36
50 Experts publish their posts in the topic GMAT Diagnostic Test Question 8 bb 29 06 Jun 2009, 20:59
14 Experts publish their posts in the topic GMAT Diagnostic Test Question 4 bb 37 06 Jun 2009, 20:06
8 Experts publish their posts in the topic GMAT Diagnostic Test Question 2 bb 26 06 Jun 2009, 18:03
Display posts from previous: Sort by

GMAT Diagnostic Test Question 5

  Question banks Downloads My Bookmarks Reviews Important topics  

Go to page   Previous    1   2   [ 27 posts ] 

Moderators: WoundedTiger, Bunuel



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

Powered by phpBB © phpBB Group and phpBB SEO

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®.