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

It is currently 20 Sep 2018, 07:39

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

On 3 sales John has received commissions of $240, $80, and $

  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: 49271
On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 10 Jan 2014, 07:06
1
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

96% (00:44) correct 4% (00:55) wrong based on 635 sessions

HideShow timer Statistics

The Official Guide For GMAT® Quantitative Review, 2ND Edition

On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185

Problem Solving
Question: 32
Category: Arithmetic Statistics
Page: 66
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

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!

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | 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?
Extra-hard Quant Tests with Brilliant Analytics

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 49271
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 10 Jan 2014, 07:06
SOLUTION

On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185

\(\frac{240+80+110+x}{4}=150\) --> solving for x gives: x=170.

Answer: B.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | 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?
Extra-hard Quant Tests with Brilliant Analytics

Director
Director
User avatar
B
Joined: 03 Feb 2013
Posts: 892
Location: India
Concentration: Operations, Strategy
GMAT 1: 760 Q49 V44
GPA: 3.88
WE: Engineering (Computer Software)
Reviews Badge
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 10 Jan 2014, 11:03
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185



Instead of adding all and making calculation messy, lets work on difference.
We need to have 150 as average, so 1st value = +90
2nd value = -70
3rd value = -40
adding all the difference = -20, so the 4th value should compensate for -20 by adding +20 to 150 which is 170. Option B)
_________________

Thanks,
Kinjal
My Debrief : http://gmatclub.com/forum/hardwork-never-gets-unrewarded-for-ever-189267.html#p1449379
My Application Experience : http://gmatclub.com/forum/hardwork-never-gets-unrewarded-for-ever-189267-40.html#p1516961
Linkedin : https://www.linkedin.com/in/kinjal-das/

Please click on Kudos, if you think the post is helpful

SVP
SVP
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1834
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 07 Aug 2014, 02:51
1
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185

Problem Solving
Question: 32
Category: Arithmetic Statistics
Page: 66
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

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!



Just observe the numbers provided

All commissions are multiples of 10; average is also multiple of 10

So the 4th commission would also be multiple of 10

Only 170 fits in

Answer = B
_________________

Kindly press "+1 Kudos" to appreciate :)

Intern
Intern
User avatar
Joined: 20 Oct 2015
Posts: 38
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 05 Jul 2016, 04:54
[quote="Bunuel"]The Official Guide For GMAT® Quantitative Review, 2ND Edition

On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185

Problem Solving
Question: 32
Category: Arithmetic Statistics
Page: 66
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

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!
[/quote)




(140+50+240+x)/(4)=150
600=430+x
x=170
Senior Manager
Senior Manager
avatar
Joined: 02 Mar 2012
Posts: 327
Schools: Schulich '16
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 05 Jul 2016, 06:48
1
B-170

one more method:TAKING RELATIVES

take avg =150

so $240is +90 more than average, $80is -70 less than average , and $110 is -40 less than average

so in total=+90-70-40=-20

so in order to compensate we need 20 more than the average we took for relative measure i.e 150,

so answer=150+20=170

hope it helps
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4022
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: On 3 sales John has received commissions of $240, $80, and $  [#permalink]

Show Tags

New post 16 Jan 2018, 10:58
Bunuel wrote:
On 3 sales John has received commissions of $240, $80, and $110, and he has 1 additional sale pending. If John is to receive an average (arithmetic mean) commission of exactly $150 on the 4 sales, then the 4th commission must be

(A) $164
(B) $170
(C) $175
(D) $182
(E) $185


240 + 80 + 110 + x = 150*4

Or, 430 + x = 600

So, x = 170, answer will be (B)

_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

Re: On 3 sales John has received commissions of $240, $80, and $ &nbs [#permalink] 16 Jan 2018, 10:58
Display posts from previous: Sort by

On 3 sales John has received commissions of $240, $80, and $

  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®.