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

It is currently 23 Oct 2019, 09:20

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

Last year the average (arithmetic mean) of monthly cookie sales triple

  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: 58465
Last year the average (arithmetic mean) of monthly cookie sales triple  [#permalink]

Show Tags

New post 09 Jan 2018, 05:32
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

64% (01:53) correct 36% (02:01) wrong based on 30 sessions

HideShow timer Statistics

Last year the average (arithmetic mean) of monthly cookie sales tripled each quarter from the per month average from the previous quarter. If the average for the first quarter's cookie sales was z, what were the total cookie sales for the year in terms of z?

A. 30z
B. 40z
C. 120z
D. 140z
E. 160z

_________________
Intern
Intern
avatar
B
Joined: 22 Nov 2017
Posts: 25
Location: United States
Concentration: Technology, Healthcare
GMAT ToolKit User
Re: Last year the average (arithmetic mean) of monthly cookie sales triple  [#permalink]

Show Tags

New post 09 Jan 2018, 06:03
1
First quarter average is z. So sum of first 3 month sales is (m1 +m2 + m3) = 3z. Next quarter monthly sales becomes 3 times earlier quarter. So m4 + m5 + m6 = 3 x 3z is 9z. Similarly quarter 3 sum becomes 27z and last quarter sum becomes 81z. So full year total sales is 3z + 9Z + 27z + 81z = 120z. Answer is C.

Sent from my SAMSUNG-SM-J120A using GMAT Club Forum mobile app
GMAT Club Bot
Re: Last year the average (arithmetic mean) of monthly cookie sales triple   [#permalink] 09 Jan 2018, 06:03
Display posts from previous: Sort by

Last year the average (arithmetic mean) of monthly cookie sales triple

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





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