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DS problem

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by ildude02 » Sun Jul 06, 2008 1:13 pm
Can someone please solve this problem from gmat prep. Trying to figure out the best way to solve these kind of percentages problems on DS. Appreciate your response.
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Source: — Data Sufficiency |
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hey

by ektamatta » Sun Jul 06, 2008 3:05 pm
Is the OA C?
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by ildude02 » Sun Jul 06, 2008 5:09 pm
yes, it is. I'm curious to see how you solved it.
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by ed09 » Sun Jul 06, 2008 6:30 pm
Hi ildude02,

I believe you've found the solution already. If still not, look at it here:
https://www.beatthegmat.com/averages-gma ... 13573.html

Best!
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by ildude02 » Mon Jul 07, 2008 9:05 am
Thanks, ed09. I kinda followed your logic, but still not 100% sure. Is there any other way to solve this besides the logic you used? I never came across the average concept you stated before. May be I need to get used to it .
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by ed09 » Mon Jul 07, 2008 7:57 pm
Hey ildude02,

I'm positive you "need to get used to it" . :)
I think the concept is much simplier than it sounds. I just added some clarifications to it. Find them at the same link, if you're interested.

Best!
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by gmatsure76 » Tue Jul 15, 2008 8:21 pm
check whether my soln is proper

we need to find (D/M+D)

D- directors
M- managers
E = M + D
ES = MS + DS - sales

from 1 - MS/M = ES/E -5000

nothing about ES , MS so not sufficient

from 2 - DS/D = ES/E + 15000

nothing about DS ,ES so not sufficient

from 1-2

MS = M * ES /E - M *5000
DS = D * ES/E + D *15000

MS + DS = M*ES/E + D * ES /e + D*15000 - M *5000

ES=ES*(M + D)/E + D * 15000 - M * 5000
ES = ES * (E)/(E) + D * 15000 - M * 5000
hence D * 15000 - M *5000 = 0

D * 150000= M *5000

we get M in terms of D which we can put in D/M+D

So C is the ans
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