GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 17 Jan 2020, 09:00

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

If the average (arithmetic mean) monthly sales of a department store

  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: 60460
If the average (arithmetic mean) monthly sales of a department store  [#permalink]

Show Tags

New post 11 Nov 2019, 03:43
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

43% (01:22) correct 57% (01:20) wrong based on 20 sessions

HideShow timer Statistics

If the average (arithmetic mean) monthly sales of a department store was y dollars during a certain period of several years, what is the average biannual sales over the same period?

(1) The period includes exactly 4 years.
(2) y = 500.


Are You Up For the Challenge: 700 Level Questions

_________________
Math Expert
avatar
V
Joined: 02 Aug 2009
Posts: 8341
Re: If the average (arithmetic mean) monthly sales of a department store  [#permalink]

Show Tags

New post 14 Nov 2019, 00:05
Bunuel wrote:
If the average (arithmetic mean) monthly sales of a department store was y dollars during a certain period of several years, what is the average biannual sales over the same period?

(1) The period includes exactly 4 years.
(2) y = 500.


Are You Up For the Challenge: 700 Level Questions


So average monthly sales is y, and biannual or 6-monthly average will be 6y..
it will not depend on number of years,,
For example let y be over x years, so Total sales over x years = 12*x*y=12xy
Now bi annual means 6-monthly or 2 times in a year......So, number of bi-annual in x years = 2x
So average biannual sales = \(\frac{12xy}{2x}=6y\)
So x doesn't matter, we just require y..

(1) The period includes exactly 4 years.
so x=4, but we don't require x.

(2) y = 500.
So, answer is 6y=6*500=3000

B
_________________
GMAT Club Bot
Re: If the average (arithmetic mean) monthly sales of a department store   [#permalink] 14 Nov 2019, 00:05
Display posts from previous: Sort by

If the average (arithmetic mean) monthly sales of a department store

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





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