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# In a small snack shop.....

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Joined: 22 Sep 2010
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In a small snack shop..... [#permalink]  08 Oct 2010, 04:38
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Difficulty:

(N/A)

Question Stats:

33% (02:37) correct 67% (01:11) wrong based on 3 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 Director Status: No dream is too large, no dreamer is too small Joined: 14 Jul 2010 Posts: 649 Followers: 37 Kudos [?]: 527 [0], given: 39 Re: In a small snack shop..... [#permalink] 08 Oct 2010, 04:45 Ans. 460 400 x 10= 4000 360 x 6 = 2160 4000-2160 = 1840/4=460 _________________ Collections:- PSof OG solved by GC members: http://gmatclub.com/forum/collection-ps-with-solution-from-gmatclub-110005.html DS of OG solved by GC members: http://gmatclub.com/forum/collection-ds-with-solution-from-gmatclub-110004.html 100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html Mixture problems in a file with best solutions: http://gmatclub.com/forum/mixture-problems-with-best-and-easy-solutions-all-together-124644.html Retired Moderator Joined: 02 Sep 2010 Posts: 805 Location: London Followers: 92 Kudos [?]: 711 [0], given: 25 Re: In a small snack shop..... [#permalink] 08 Oct 2010, 15:09 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

Avg(10 days) = (Avg(6 days)*6 + Avg(4 days)*4)/10
10*$400 = 6*$360 + 4*x
x+6*90=1000
x=460

_________________
Re: In a small snack shop.....   [#permalink] 08 Oct 2010, 15:09
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