|
Author |
Message |
|
TAGS:
|
|
|
Manager
Joined: 22 Sep 2010
Posts: 93
Followers: 1
Kudos [?]:
8
[0], given: 0
|
In a small snack shop, the average (arithmetic mean) revenue [#permalink]
 22 Oct 2010, 05:49
Question Stats:
92% (01:53) correct
7% (00:45) wrong based on 56 sessions
In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days, what was the average daily revenue for the last 4 days? A. $420 B. $440 C. $450 D. $460 E. $480
Last edited by Bunuel on 09 Oct 2012, 03:55, edited 1 time in total.
Edited the question.
|
|
|
|
|
|
|
Manager
Joined: 17 Aug 2010
Posts: 54
Followers: 0
Kudos [?]:
3
[0], given: 18
|
Re: In a small snack shop......... [#permalink]
22 Oct 2010, 05:57
pzazz12 wrote: In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days,
what was the average daily revenue for the last 4 days?
A. $420
B. $440
C. $450
D. $460
E. $480 D. $460 is my answer. 400 = x/10 x = 4000 For first 6 days = 360 * 6 = $2160 therefore for the last 4 days revenue is $4000 - $2160 = 3840 hence, airthmatic mean = 3840/4 = $460 Please let me know the OA. Also, I am very bad in explaining things. I am waiting for Bunuel to respond. He is extremly good in explaining solution.
_________________
I don't want kudos.. I want to see smile on your face if I am able to help you.. which is priceless.
|
|
|
|
|
|
GMAT Club team member
Joined: 02 Sep 2009
Posts: 12116
Followers: 1879
Kudos [?]:
10133
[1] , given: 965
|
Re: In a small snack shop......... [#permalink]
22 Oct 2010, 05:58
1
This post received
KUDOS
pzazz12 wrote: In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days,
what was the average daily revenue for the last 4 days?
A. $420
B. $440
C. $450
D. $460
E. $480 The average revenue was $400 per day over a 10-day period --> total revenue over 10-day period is 10*$400=$4,000; The average daily revenue was $360 for the first 6 days --> total revenue for the first 6 days is 6*$360=2,160; Total revenue for the last 4 days is $4,000-2,160=$1,840; Average daily revenue for the last 4 days is $1,840/4=$460. Answer: D.
_________________
NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!
PLEASE READ AND FOLLOW: 11 Rules for Posting!!!
RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders
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. NEW!!! ,11 Mixed Questions NEW!!!, 12 Fresh Meat NEW!!!
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. NEW!!!, 11 New DS set. NEW!!!
What are GMAT Club Tests?
25 extra-hard Quant Tests
Find out what's new at GMAT Club - latest features and updates
|
|
|
|
|
|
Manager
Joined: 17 Aug 2010
Posts: 54
Followers: 0
Kudos [?]:
3
[0], given: 18
|
Re: In a small snack shop......... [#permalink]
22 Oct 2010, 06:00
Like I said, what Bunuel says is OA for me. 
_________________
I don't want kudos.. I want to see smile on your face if I am able to help you.. which is priceless.
|
|
|
|
|
|
Intern
Joined: 01 Oct 2010
Posts: 1
Followers: 0
Kudos [?]:
0
[0], given: 20
|
Re: In a small snack shop......... [#permalink]
23 Oct 2010, 06:17
I solved it in another way, but not sure whether its correct. Can some one help me by validating..
Let 'x' be the average daily revenue for last 4 days.
[6(360)+4(x)]/10 = 400
solving, x = 460
Thanks in advance
|
|
|
|
|
|
Intern
Joined: 15 Apr 2010
Posts: 48
Followers: 0
Kudos [?]:
10
[0], given: 10
|
Re: In a small snack shop......... [#permalink]
08 Oct 2012, 22:33
weighted average
total 10 days, avg10 of this period is 400
first 6 days avg6 is 360 which is deltaAvg6 = 40 away from the overall avg10
last 4 day avg4 must have more weight to pull the avg10 to 400
(if 5 days-5 days then last 5 must have 440 so that avg10 is pulled back to 400, but this is 6/4, so we know last 4 days avg must have much more weight, so avg4 > 440, eliminate few choices)
since ratio of weight of 2 periods is 6/4 = 3/2, the avg4 must compensate for the loss of deltaAvg6 a 3/2 amount of deltaAvg6 so that the avg10 is pulled back to 400. therefore the last 4 days must have deltaAvg4 = 3/2 * deltaAvg6 = 3/2 * 40 = 60.
so avg4 = 400 + deltaAvg4 = 400 + 60 = 460 --> D
|
|
|
|
|
|
Senior Manager
Status: Kick Ass Gmat
Affiliations: Trained Stage Actor,First aider,Swimmer,Sketch artist,Writer
Joined: 28 Jun 2011
Posts: 422
Location: India
Concentration: Finance, General Management
Schools: Darden '16, McCombs '15, Tepper '16, Kenan-Flagler '16, McDonough '16, ISB '16, Tulane '16, Boston U '16, Krannert '16, Foster '16, W.P. Carey
GMAT Date: 09-06-2013
GPA: 3.5
WE: Consulting (Human Resources)
Followers: 12
Kudos [?]:
27
[0], given: 33
|
Re: In a small snack shop, the average (arithmetic mean) revenue [#permalink]
09 Oct 2012, 07:05
460 400 x 10= 4000 360 x 6 = 2160 4000-2160 = 1840/4=460
_________________
1 KUDOS = 1 THANK
Indian Bschools Accepting Gmat--> indian-b-schools-accepting-gmat-scores-82525.html
My Gmat Daily Diary--> how-much-time-should-i-spend-120796.html
All Gmat Practice CAT's-->http://gmatclub.com/forum/all-gmat-cat-practice-tests-links-prices-reviews-77460.html
Mba Ranking 2013--> all-2013-mba-rankings-99812.html
How to Convert Indian GPA/ Percentage to US 4 pt. GPA scale--> how-to-convert-indian-gpa-percentage-to-us-4-pt-gpa-scale-124249.html
GMAT MATH BOOK in downloadable PDF format --> gmat-math-book-in-downloadable-pdf-format-130609.html
POWERSCORE CRITICAL REASONING BIBLE - FULL CHAPTER NOTES --> powerscore-critical-reasoning-bible-full-chapter-notes-115864.html
Result correlation between GMAT and GMAT Club's Tests -->http://gmatclub.com/forum/result-correlation-between-gmat-and-gmat-club-s-tests-30989.html
Best GMAT Stories - Period! --> best-gmat-stories-period-98512.html
----
---
--
-
Kick Ass Gmat
|
|
|
|
|
|
Manager
Joined: 13 Feb 2012
Posts: 149
Location: Italy
Concentration: General Management, Entrepreneurship
GMAT 1: 560 Q36 V34
GPA: 3.1
WE: Sales (Transportation)
Followers: 4
Kudos [?]:
-1
[0], given: 85
|
Re: In a small snack shop, the average (arithmetic mean) revenue [#permalink]
15 Dec 2012, 08:47
Bunuel's way of solving is definitely the most straight forward one; thanks!
_________________
"The Burnout" - My Debrief
Kudos if I helped you 
Andy
|
|
|
|
|
|
Intern
Joined: 24 Apr 2012
Posts: 44
Followers: 0
Kudos [?]:
8
[0], given: 1
|
Re: In a small snack shop, the average (arithmetic mean) revenue [#permalink]
16 Dec 2012, 04:08
Ans: the total revenue for 10 days is 10x400=4000 and the total revenue for first 6 days is 6x360=2160, so the average for last 4 days will be (4000-2160)/4 = 460 (D).
_________________
www.mnemoniceducation.com
TURN ON YOUR MINDS!!!
|
|
|
|
|
|
|
Re: In a small snack shop, the average (arithmetic mean) revenue
[#permalink]
16 Dec 2012, 04:08
|
|
|
|
|
|
|
|
|
|
|
close
