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# how to solve this problem, answer is no available

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Intern
Joined: 26 Mar 2012
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05 Apr 2012, 14:32
1.THE COST TO CHARTER A PLANE IS "D" DOLLARS, WHICH IS TO BE SHARED EQUALLY AMONG THE PASSENGER. THE NUMBER OF PASSENGERS, WHICH WAS ORIGINALLY 12, INCREASES TO 18, DECREASING THE COST BY X AMOUNT PER PERSON.

I would like to know how i can solve this problem in less than 2 min.
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Joined: 21 Sep 2008
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Concentration: Strategy, Economics
GMAT Date: 07-17-2015
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05 Apr 2012, 15:12
What's the question, the new avg cost/customer?
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Jerome: *$&#(*%&(*#%& Manager Joined: 22 Feb 2012 Posts: 93 Schools: HBS '16 GMAT 1: 740 Q49 V42 GMAT 2: 670 Q42 V40 GPA: 3.47 WE: Corporate Finance (Aerospace and Defense) Followers: 2 Kudos [?]: 23 [0], given: 25 Re: how to solve this problem, answer is no available [#permalink] ### Show Tags 05 Apr 2012, 15:22 What is the question? If it is what is x? You cannot solve it based on the given info.. That being said, here is what I would do: Cost = d so cost per person = d/12 initially and then d/18 so cost decreases from d/12 to d/18 thus d/12 - d/18 = x x = d/36 Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7125 Location: Pune, India Followers: 2137 Kudos [?]: 13688 [0], given: 222 Re: how to solve this problem, answer is no available [#permalink] ### Show Tags 09 Apr 2012, 09:17 rovshan85 wrote: 1.THE COST TO CHARTER A PLANE IS "D" DOLLARS, WHICH IS TO BE SHARED EQUALLY AMONG THE PASSENGER. THE NUMBER OF PASSENGERS, WHICH WAS ORIGINALLY 12, INCREASES TO 18, DECREASING THE COST BY X AMOUNT PER PERSON. I would like to know how i can solve this problem in less than 2 min. I am not sure if this is what you meant but here is the method I use: Say, number of passengers was 12 and is now 18. Say the cost per person has decreased by$25.

Ratio of number of passenger then and now = 12:18 = 2:3
Then, ratio of cost per person then and now = 3:2 (Cost per person is inversely proportional to number of passengers since Cost per person = Total cost/No of passengers)

The difference of 1 on the ratio scale (3:2) corresponds to 25 so cost per person then was 3*25 = 75 and cost per person now is 2*25 = 50

Also, the total cost 'd' = 75*12 or 50*18 = 900
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Re: how to solve this problem, answer is no available   [#permalink] 09 Apr 2012, 09:17
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