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# Out of 800 employees in a company, 70% of those are long

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Senior Manager
Joined: 15 Aug 2004
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Out of 800 employees in a company, 70% of those are long [#permalink]

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06 Aug 2006, 08:38
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Out of 800 employees in a company, 70% of those are long term employees. If "y" of these long term employees retire and no others changes happen. What is the value of y which makes the percent of long term employees at 60%.

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For me this should have been

70/100 * 800 = 560

(560 -y / 800) *100 = 60

=> Y = 80.... However GMAT PREP says y should be 200...

Any clues plz.

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Manager
Joined: 09 Jul 2006
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06 Aug 2006, 10:13
(560-y)/(800-y) since all employee need to be subtracted by Y also

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Manager
Joined: 20 Mar 2006
Posts: 200

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Re: GMAT Prep - PS [#permalink]

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06 Aug 2006, 12:19
sumitsarkar82 wrote:
Out of 800 employees in a company, 70% of those are long term employees. If "y" of these long term employees retire and no others changes happen. What is the value of y which makes the percent of long term employees at 60%.

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LT employees= 70*800/100 =560
y of LT employees retire

Needed 560-y/800-y = 0.6
560-y = 480 -0.6y
80 = 0.4y
--> y = 200

Check soln -- 560-200/800-200 = 360/600
=60%

Hence y =200

Heman

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Re: GMAT Prep - PS   [#permalink] 06 Aug 2006, 12:19
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