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

It is currently 01 Sep 2015, 18:30
GMAT Club Tests

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

(0.0036)(2.8) / (0.04)(0.1)(0.003) =

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 02 Dec 2012
Posts: 178
Followers: 3

Kudos [?]: 988 [0], given: 0

(0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 07 Dec 2012, 02:52
4
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

63% (02:21) correct 37% (01:30) wrong based on 759 sessions
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084
[Reveal] Spoiler: OA
Expert Post
3 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 29173
Followers: 4736

Kudos [?]: 50044 [3] , given: 7519

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 07 Dec 2012, 02:58
3
This post received
KUDOS
Expert's post
4
This post was
BOOKMARKED
Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084


\(\frac{0.0036*2.8}{0.04*0.1*0.003}=\frac{(36*10^{-4})*(28*10^{-1})}{(4*10^{-2})(1*10^{-1})*(3*10^{-3})}=\frac{36*28*10^{(-4-1)}}{4*3*10^{(-2-1-3)}}=84*10=840\).

Answer: A.
_________________

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

PLEASE READ AND FOLLOW: 12 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 ; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) ; 12. Tricky questions from previous years.

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

GMAT Club Premium Membership - big benefits and savings

SVP
SVP
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1859
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Followers: 26

Kudos [?]: 1069 [0], given: 193

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 13 Jun 2013, 01:40
While reading the problem, I re-wrote in the following way:
36/100000 * 28/10 * 100 / 4 * 10/1 * 1000/3
Simplifying further, Answer = A = 840
_________________

Kindly press "+1 Kudos" to appreciate :)

Intern
Intern
avatar
Joined: 04 Aug 2013
Posts: 6
Concentration: Sustainability, Entrepreneurship
WE: Architecture (Energy and Utilities)
Followers: 0

Kudos [?]: 4 [0], given: 8

GMAT ToolKit User
Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 29 Oct 2013, 15:13
I calculated the power of 10.
It was 10^5 / 10^-6.
Hence the ans. will end with 10^1. Its only A.
Manager
Manager
avatar
Joined: 23 May 2013
Posts: 106
Concentration: Strategy, Social Entrepreneurship
GMAT Date: 08-05-2015
Followers: 1

Kudos [?]: 50 [0], given: 29

GMAT ToolKit User
(0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 25 Aug 2014, 06:25
With questions like this, take a look at the answers first. Notice the only distinction between the answers is the factor of ten; thus, an exact calculation is not necessary to solve the problem, just a quick approximation.

.0036*2.8 is ~.0036*3, which can be approximated to .01.

.04*.1 = .004

Thus we have (.01)/(.004*.003). We can cancel out the powers of ten to give us 1/(.4*.003), which is 1/(.0012).

.0012 in fraction form is 12/10,000. Thus, our answer is can be given as 10,000/12.

840 is the only answer that comes close. Answer:A

Using the approximation method you can easily solve this question in 1:30 - 2:00.
Manager
Manager
avatar
Joined: 07 Apr 2014
Posts: 147
Followers: 1

Kudos [?]: 13 [0], given: 81

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 11 Sep 2014, 05:31
Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084




36(28)*10^-5 / 12 * 10^-6


84 /10^-1 = 840
Intern
Intern
avatar
Joined: 15 Sep 2014
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 5

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 23 Sep 2014, 10:09
I think there is mistake in the last part of the solution.
84 /10^-1 = 840 . This should be 8.4 not 840.
84/10^1 = 840.

Let me know if my understanding is correct.
Manager
Manager
avatar
Joined: 07 Apr 2014
Posts: 147
Followers: 1

Kudos [?]: 13 [0], given: 81

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 23 Sep 2014, 23:49
preetnyc wrote:
I think there is mistake in the last part of the solution.
84 /10^-1 = 840 . This should be 8.4 not 840.
84/10^1 = 840.

Let me know if my understanding is correct.



1/10^-1 = 10.. (the way i used power without symbol might create problem)

check below url..

Reciprocal in http://gmatclub.com/forum/math-number-theory-88376.html
1 KUDOS received
Intern
Intern
avatar
Joined: 29 Mar 2014
Posts: 14
Followers: 0

Kudos [?]: 3 [1] , given: 23

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 24 Feb 2015, 11:26
1
This post received
KUDOS
Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084


With these kinds of equations the best thing to do is move the decimal places to the right, remember, what you move in the numerator has to occur in the denominator.

1) ORIGINAL EQUATION: (0.0036)(2.8) / (0.04)(0.1)(0.003)

2) MOVE 2.8 TWO PLACES TO THE RIGHT AND MOVE 0.04 TWO PLACES TO THE RIGHT, EQUATION THEN BECOMES: (0.0036)(280) / (4)(0.1)(0.003)
YOU CAN NOW DIVIDE 280 BY 4 - CANCEL OUT THE FOUR AND THE 280 BECOMES 70

3) MOVE 0.0036 ONE PLACE TO THE RIGHT AND MOVE 0.1 IN THE DENOMINATOR ONE PLACE TO THE RIGHT, EQUATION THEN BECOMES: (0.036) (70) / (1) (0.003)

4) AGAIN MOVE 0.036 TWO PLACES TO THE RIGHT AND MOVE 0.003 TWO PLACES TO THE RIGHT, EQUATION THEN BECOMES: (36)(70) / (1)(3)

5) CANCEL OUT THE THREE AND THE 36 TO FURTHER SIMPLIFY, YOUR EQUATION THEN BECOMES 12*70 = 840 WHICH IS ANSWET CHOICE A
Expert Post
Optimus Prep Instructor
User avatar
Joined: 06 Nov 2014
Posts: 491
Followers: 6

Kudos [?]: 92 [0], given: 2

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) = [#permalink] New post 28 Feb 2015, 07:26
Expert's post
Walkabout wrote:
(0.0036)(2.8) / (0.04)(0.1)(0.003) =

(A) 840.0
(B) 84.0
(C) 8.4
(D) 0.84
(E) 0.084


Given that (0.0036)(2.8) / (0.04)(0.1)(0.003)
= [(36/1000)(28/10)] / [(4/100)(1/10)(3/100)]
= [(36*28)/(10000)] / [(4*1*3)/(100*10*100)]
= [(36*28)/(4*1*3)] * [(100*10*100) / 10000]
= (3*28) * 10
= 840
Hence option A

--
Optimus Prep's GMAT On Demand course for only $299 covers all verbal and quant. concepts in detail. Visit the following link to get your 7 days free trial account: http://www.optimus-prep.com/gmat-on-demand-course
_________________

Cassandra Wolff
Customer Support | Optimus Prep
 
Facebook Linkedin Youtube Twitter slideshare Google+
 

Re: (0.0036)(2.8) / (0.04)(0.1)(0.003) =   [#permalink] 28 Feb 2015, 07:26
Display posts from previous: Sort by

(0.0036)(2.8) / (0.04)(0.1)(0.003) =

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.