It is currently 24 Jun 2017, 10:43

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A music store has 90 different CD's

Author Message
TAGS:

### Hide Tags

Senior Manager
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 326
A music store has 90 different CD's [#permalink]

### Show Tags

29 Sep 2011, 10:10
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:46) wrong based on 3 sessions

### HideShow timer Statistics

Q) A music store has 90 different CD's. If an average price is $12 per CD and 20 of the most expensive ones are$20 each, what is the average price of the remaining CD's?

[Reveal] Spoiler:
9.71

_________________

I'm the Dumbest of All !!

Intern
Joined: 24 Sep 2011
Posts: 9
Re: A music store has 90 different CD's [#permalink]

### Show Tags

29 Sep 2011, 17:06
1
KUDOS
[(20)(20)+(70)(X)]/90 = 12
400 + 70X = 1080
70X = 680
X = 9.71
Director
Joined: 01 Feb 2011
Posts: 755
Re: A music store has 90 different CD's [#permalink]

### Show Tags

29 Sep 2011, 21:13
(x1+x2+....x70+ (20*20)) /90 = 12

=> x1+x2+....x70 = 680

=> average of the above 70 numbers = 680/70 = 9.71
Manager
Joined: 20 Nov 2010
Posts: 218
Re: A music store has 90 different CD's [#permalink]

### Show Tags

01 Oct 2011, 02:07
easy one .. ( (90*12) - (20*20) ) / (90-20) = 9.71
_________________

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
MGMAT 6 650 (51,31) on 31/8/11
MGMAT 1 670 (48,33) on 04/9/11
MGMAT 2 670 (47,34) on 07/9/11
MGMAT 3 680 (47,35) on 18/9/11
GMAT Prep1 680 ( 50, 31) on 10/11/11

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned

Manager
Joined: 20 Aug 2011
Posts: 146
Re: A music store has 90 different CD's [#permalink]

### Show Tags

01 Oct 2011, 02:42
Price= 10(9*12-2*20)/70
=(108-40)/7
68/7
9.71
Re: A music store has 90 different CD's   [#permalink] 01 Oct 2011, 02:42
Similar topics Replies Last post
Similar
Topics:
5 A book store has received 8 different books, of which 3/8 are novels, 4 31 May 2017, 18:57
In a store 6 different CDs are there. If John can buy 2 CDs, how many 7 03 May 2017, 22:34
2 In the figure above, if BC = CD and angle ADC = 90 degrees, then what 5 07 Mar 2017, 17:12
3 Anna and Carol buy CDs and tapes at a music 2 10 Apr 2017, 14:08
15 A certain music store stocks 800 cellos and 600 violas. Of 10 16 Dec 2016, 09:23
Display posts from previous: Sort by