Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 24 May 2013, 16:54
Customize  |  Hide

Search
Register
New posts
Unanswered

The average distance between the Sun and a certain planet is

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
1 KUDOS received
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11611
Followers: 1801

Kudos [?]: 9595 [1] , given: 829

GMAT Tests User CAT Tests
Top Member of the Month
The average distance between the Sun and a certain planet is [#permalink] New post 15 Oct 2012, 04:36
1
This post received
KUDOS
00:00

Question Stats:

65% (02:10) correct 34% (00:53) wrong based on 7 sessions
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

The average distance between the Sun and a certain planet is approximately 2.3 x 10^14 inches. Which of the following is closest to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)

(A) 7.1 x 10^8
(B) 5.9 x 10^9
(C) 1.6 x 10^10
(D) 1.6 x 10^11
(E) 5.9 x 10^11

Practice Questions
Question: 65
Page: 161
Difficulty: 650


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a solution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!
[Reveal] Spoiler: OA

_________________

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

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. NEW!!!

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. NEW!!!


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

Find out what's new at GMAT Club - latest features and updates

Kaplan Promo CodeKnewton GMAT Discount CodesGMAT Pill GMAT Discount Codes
2 KUDOS received
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11611
Followers: 1801

Kudos [?]: 9595 [2] , given: 829

GMAT Tests User CAT Tests
Top Member of the Month
Re: The average distance between the Sun and a certain planet is [#permalink] New post 15 Oct 2012, 04:36
2
This post received
KUDOS
SOLUTION

The average distance between the Sun and a certain planet is approximately 2.3 x 10^14 inches. Which of the following is closest to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)

(A) 7.1 x 10^8
(B) 5.9 x 10^9
(C) 1.6 x 10^10
(D) 1.6 x 10^11
(E) 5.9 x 10^11

The distance in kilometers would be: \frac{2.3*10^{14}}{3.9*10^4}\approx{\frac{23*10^{13}}{4*10^4}}\approx{6*10^9}.

Answer: B.
_________________

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

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. NEW!!!

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. NEW!!!


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

Find out what's new at GMAT Club - latest features and updates

1 KUDOS received
Senior Manager
Senior Manager
Joined: 24 Aug 2009
Posts: 283
Schools: Harvard, Columbia, Stern, Booth, LSB,
Followers: 2

Kudos [?]: 138 [1] , given: 218

Re: The average distance between the Sun and a certain planet is [#permalink] New post 15 Oct 2012, 04:42
1
This post received
KUDOS
Distance between the Sun and a certain planet in Inches = 2.3 x 10^14
1 kilometer = 3.9 x 10^4 inches
Distance between the Sun and a certain planet in Km = (2.3 x 10^14)/ (3.9 x 10^4)
= (23/39) * 10^10
= (230/39) * 10^9
= 5.9 * 10^9

Answer B
_________________

If you like my Question/Explanation or the contribution, Kindly appreciate by pressing KUDOS.
Kudos always maximizes GMATCLUB worth -Game Theory

2 KUDOS received
Chat Moderator
User avatar
Joined: 31 Oct 2011
Posts: 257
Schools: Wharton '16, Ross '16, Tuck '16, Duke '16, Darden '16, Johnson '16, Tepper '16
GMAT 1: 690 Q45 V40
WE: Asset Management (Mutual Funds and Brokerage)
Followers: 17

Kudos [?]: 72 [2] , given: 30

Re: The average distance between the Sun and a certain planet is [#permalink] New post 15 Oct 2012, 05:04
2
This post received
KUDOS
Good question.

I took 2.3 x 10^14and rounded down to 2*10^14, and took 3.9*10^4 and rounded up to 4*10^4.

Then, I did a unit conversion from Inches to Kilometers: (2*10^14 Inches) * (\frac{1 Kilometer}{(4*10^4 Inches)})

Canceling out, we get \frac{(2*10^14 Inches)}{(4*10^4 Inches)}*1 Kilometer = 0.5*10^10 Kilometer or 5*10^9 Kilometers

Since we rounded to begin with, we have to look for the solution that is both closest to our answer AND makes the most sense. In this case, the answer is
[Reveal] Spoiler:
B, 5.9*10^9 Kilometers.

_________________

My Blog: http://hamm0.wordpress.com/
Most Recent Post: Points, Runs, and Goals Essays

1 KUDOS received
Director
Director
User avatar
Status: Disappointed devil..
Joined: 15 Sep 2012
Posts: 592
Location: India
Concentration: Strategy, General Management
Schools: Ross '15 (D), Duke '15 (D), Johnson '15 (S), INSEAD Jan '14
WE: Information Technology (Computer Software)
Followers: 20

Kudos [?]: 225 [1] , given: 23

GMAT ToolKit User
Re: The average distance between the Sun and a certain planet is [#permalink] New post 15 Oct 2012, 10:59
1
This post received
KUDOS
Distance in inches = 2.3 * 10^14
Hence distance in KM = 2.3 * 10^14 / 3.9* 10^4
= 2.3/3.9 * 10^10
=230/39 * 10^9
230/39 is approximately 230+/40
hence approximate distance = 5.9 * 10^9

Ans B

Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

The average distance between the Sun and a certain planet is approximately 2.3 x 10^14 inches. Which of the following is closest to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)

(A) 7.1 x 10^8
(B) 5.9 x 10^9
(e) 1.6 x 10^10
(0) 1.6 x 10^11
(E) 5.9 x 10^11

Practice Questions
Question: 65
Page: 161
Difficulty: 650


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a solution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

_________________

Lets Kudos!!! ;-)
Black Friday Debrief
Most important component: Cast you vote

2 KUDOS received
Manager
Manager
Joined: 21 Sep 2012
Posts: 235
Followers: 1

Kudos [?]: 64 [2] , given: 60

Re: The average distance between the Sun and a certain planet is [#permalink] New post 16 Oct 2012, 03:43
2
This post received
KUDOS
1 km/3.9 * 10^4 inches = X km /2.3 * 10^14 inches

cross multiply

X = 2.3 * 10^4/ 3.9 * 10^4

now we have to approximate

2.3 * 10 * 10^9 / 4

therefore 23*10^9/4 = 5.6 * 10^9 so which is close to answer B 5.9 * 10^9
_________________

Click kudos if my post helped.

Create a login and try 500+ questions for free - http://www.gmatpill.com/gmat-practice-test/

Amazing free video solutions for OG 12,13,quant review etc - http://www.gmatquantum.com/

GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11611
Followers: 1801

Kudos [?]: 9595 [0], given: 829

GMAT Tests User CAT Tests
Top Member of the Month
Re: The average distance between the Sun and a certain planet is [#permalink] New post 19 Oct 2012, 04:56
SOLUTION

The average distance between the Sun and a certain planet is approximately 2.3 x 10^14 inches. Which of the following is closest to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)

(A) 7.1 x 10^8
(B) 5.9 x 10^9
(C) 1.6 x 10^10
(D) 1.6 x 10^11
(E) 5.9 x 10^11

The distance in kilometers would be: \frac{2.3*10^{14}}{3.9*10^4}\approx{\frac{23*10^{13}}{4*10^4}}\approx{6*10^9}.

Answer: B.

Kudos points given to everyone with correct solution. Let me know if I missed someone.
_________________

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

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. NEW!!!

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. NEW!!!


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

Find out what's new at GMAT Club - latest features and updates

Director
Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 551
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 13 [0], given: 560

GMAT Tests User
Re: The average distance between the Sun and a certain planet is [#permalink] New post 22 Oct 2012, 09:04
Bro Bunuel, I wonder who you are and BB also declared you as the mystery man.. :) but you are doing an awesome job out here! thank you for all your help.
My Question is

what if 6.1 x 10^9 is also one of the answer choices? what will your approach be in this case?
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : end-of-my-gmat-journey-149328.html#p1198742

GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11611
Followers: 1801

Kudos [?]: 9595 [0], given: 829

GMAT Tests User CAT Tests
Top Member of the Month
Re: The average distance between the Sun and a certain planet is [#permalink] New post 23 Oct 2012, 05:46
sachindia wrote:
My Question is

what if 6.1 x 10^9 is also one of the answer choices? what will your approach be in this case?


I wouldn't expect such option to be thrown by the GMAC, but in this case the answer still would be the same:

\frac{2.3*10^{14}}{3.9*10^4}={\frac{23*10^{13}}{3.9*10^4}}={\frac{23}{3.9}*10^9}.

Now, since \frac{23}{3.9} is less than 6 (3.9*6=23.4), then 5.9 x 10^9 would be the closest answer choice than 6.1 x 10^9.

Hope it's clear.
_________________

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

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. NEW!!!

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. NEW!!!


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

Find out what's new at GMAT Club - latest features and updates

Senior Manager
Senior Manager
User avatar
Joined: 13 Aug 2012
Posts: 468
Followers: 12

Kudos [?]: 75 [0], given: 11

GMAT ToolKit User GMAT Tests User
Re: The average distance between the Sun and a certain planet is [#permalink] New post 19 Dec 2012, 03:49
=\frac{2.3 x 10^{14}}{3.9 x 10^{4}}=\frac{23 x 10^{9}}{4}~5.7x10^9

Answer: B
Re: The average distance between the Sun and a certain planet is   [#permalink] 19 Dec 2012, 03:49
    Similar topics Author Replies Last post
Similar
Topics:
 New posts The surface of a certain planet reflects 80 percent of the DLMD 2 17 Jan 2005, 11:29
Popular new posts Since the planets revolve around the sun in orbits like the sangarelli 10 29 Sep 2006, 00:03
New posts The surface of a certain planet reflects 80 percent of the gorden 1 11 Nov 2008, 17:07
New posts The surface of a certain planet reflects 80 percent of the Jcpenny 1 11 Nov 2008, 17:13
New posts EXPERTS_POSTS_IN_THIS_TOPIC Since Neptune is the farthest planet from the sun and is carcass 4 11 Apr 2013, 10:43
Display posts from previous: Sort by

The average distance between the Sun and a certain planet is

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com