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

It is currently 14 Dec 2019, 11:06

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

The average (arithmetic mean) of 20 numbers is 30, and the average (ar

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 59725
The average (arithmetic mean) of 20 numbers is 30, and the average (ar  [#permalink]

Show Tags

New post 22 Mar 2019, 00:56
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

81% (00:56) correct 19% (00:54) wrong based on 37 sessions

HideShow timer Statistics

GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 18 Aug 2017
Posts: 5483
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: The average (arithmetic mean) of 20 numbers is 30, and the average (ar  [#permalink]

Show Tags

New post 22 Mar 2019, 04:02
Bunuel wrote:
The average (arithmetic mean) of 20 numbers is 30, and the average (arithmetic mean) of 30 other numbers is 20. What is the average of all 50 numbers?

(A) 23
(B) 24
(C) 25
(D) 26
(E) 27


sum of 20 no = 600
and sum of 30 o = 600
so
1200/50 = 24
IMO B
Target Test Prep Representative
User avatar
V
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8701
Location: United States (CA)
Re: The average (arithmetic mean) of 20 numbers is 30, and the average (ar  [#permalink]

Show Tags

New post 24 Mar 2019, 18:35
1
Bunuel wrote:
The average (arithmetic mean) of 20 numbers is 30, and the average (arithmetic mean) of 30 other numbers is 20. What is the average of all 50 numbers?

(A) 23
(B) 24
(C) 25
(D) 26
(E) 27


Average = (20 x 30 + 30 x 20)/50

Average = 1200/50

Average = 24

Answer: B
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Manager
Manager
avatar
B
Joined: 17 Jul 2016
Posts: 54
Re: The average (arithmetic mean) of 20 numbers is 30, and the average (ar  [#permalink]

Show Tags

New post 24 Mar 2019, 18:42
30(2/5) +20(3/5)=24
GMAT Club Bot
Re: The average (arithmetic mean) of 20 numbers is 30, and the average (ar   [#permalink] 24 Mar 2019, 18:42
Display posts from previous: Sort by

The average (arithmetic mean) of 20 numbers is 30, and the average (ar

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





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne