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

It is currently 19 Dec 2018, 07:48

TODAY:

MIT Sloan R1 Decisions - Join MIT Chat for Live Updates | Chat with UCLA Anderson Adcom @9am PT | Chat with Yale SOM R1 Admit 10am PT


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
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • Happy Christmas 20% Sale! Math Revolution All-In-One Products!

     December 20, 2018

     December 20, 2018

     10:00 PM PST

     11:00 PM PST

    This is the most inexpensive and attractive price in the market. Get the course now!
  • Key Strategies to Master GMAT SC

     December 22, 2018

     December 22, 2018

     07:00 AM PST

     09:00 AM PST

    Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

Cask A and Cask B each contain many white balls and black balls. All

  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: 51307
Cask A and Cask B each contain many white balls and black balls. All  [#permalink]

Show Tags

New post 25 Sep 2018, 03:54
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

100% (02:04) correct 0% (00:00) wrong based on 13 sessions

HideShow timer Statistics

Cask A and Cask B each contain many white balls and black balls. All of the black balls have the same diameter. The diameter of each black ball is 4 inches less than the average diameter of the balls in Cask A and 2 inches greater than the average diameter of the balls in Cask B. What is the difference between average (arithmetic mean) diameter, in inches, of the balls in Cask A and of the balls in Cask B?

(A) 4
(B) 6
(C) 7
(D) 8
(E) 10

_________________

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

Manager
Manager
User avatar
G
Joined: 07 Aug 2018
Posts: 110
Location: United States (MA)
GMAT 1: 560 Q39 V28
GMAT 2: 670 Q48 V34
CAT Tests
Cask A and Cask B each contain many white balls and black balls. All  [#permalink]

Show Tags

New post 27 Sep 2018, 05:49
\(BB\) = Black balls
\(BBd\) = Black Balls diameter
\(Ad\) = Average diameter in Cask A
\(Bd\) = Average diameter in Cask B

We know that every Black Ball has the same diameter.

Therefore, from the question stem we get:
\(BBd-4=Ad\) --> "The diameter of each black ball is 4 inches less than the average diameter of the balls in Cask A"
and
\(BBd+2=Bd\) --> "The diameter of each black ball is [...] and 2 inches greater than the average diameter of the balls in Cask B."

The questions asks for difference between \(Ad\) and \(Bd\).
--> \((BBd+2)-(BBd+4)=-6\)
The difference is 6. Hence, B.
_________________

Quantitative Megathread:https://gmatclub.com/forum/ultimate-gmat-quantitative-megathread-244512.html
Verbal Megathread:https://gmatclub.com/forum/all-you-need-for-gmat-verbal-164070.html
Flashcards Quant + Verbal:https://gmatclub.com/forum/gmat-flashcards-108651.html
Thursdays with Ron:https://gmatclub.com/forum/manhattan-s-thursdays-with-ron-consolidated-video-index-223612.html#p2138753

GMAT Club Bot
Cask A and Cask B each contain many white balls and black balls. All &nbs [#permalink] 27 Sep 2018, 05:49
Display posts from previous: Sort by

Cask A and Cask B each contain many white balls and black balls. All

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


Copyright

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®.