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Of the 800 employees of Company X, 70 percent have been with

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Of the 800 employees of Company X, 70 percent have been with [#permalink] New post 06 May 2010, 11:34
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A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

51% (02:02) correct 49% (01:20) wrong based on 57 sessions
Of the 800 employees of Company X, 70 percent have been with the company for at least ten years. If y of these "long-term" members were to retire and no other employee changes were to occur, what value of y would reduce the percent of "long-term" employees in the company to 60 percent ?

A. 200
B. 160
C. 112
D. 80
E. 56
[Reveal] Spoiler: OA

Last edited by Bunuel on 03 Dec 2012, 00:14, edited 1 time in total.
Renamed the topic and edited the question.
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Re: GMAT PREP (PS) [#permalink] New post 06 May 2010, 11:49
I think it's D.

Total no. of employees : 800

No. of long-term employees : 70% --> 0.7 * 800 --> 560

No. of employees to retire : y

For the long-term employees to be 60% , y = 560 - 60% of 800 = 560 - 480 = 80 !

Pls. post the OA..
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Re: GMAT PREP (PS) [#permalink] New post 06 May 2010, 13:44
Expert's post
Of the 800 employees of Company X, 70 percent have been with the company for at least ten years. If y of these "long-term" members were to retire and no other employee changes were to occur, what value of y would reduce the percent of "long-term" employees in the company to 60 percent ?

A. 200
B. 160
C. 112
D. 80
E. 56

The # of "long-term" employees is 70%*800=560.

After y of them retire new # of "long-term" employees would become 560-y.
Total # of employees would become 800-y.

We want 560-y to be 60% of 800-y --> 560-y=(800 -y)*60% --> y = 200.

Answer: A.
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Re: GMAT PREP (PS) [#permalink] New post 07 May 2010, 22:50
Agree with Bunuel - I got A as well

Remember that when you're "removing" the y members, you're removing y members from both the long term employees AND the total employees
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Re: GMAT PREP (PS) [#permalink] New post 02 Dec 2012, 21:28
Original (Long-Term is 70%)
Total = 800
Long-Term = .7(800) = 560

New (Long-Term is 60%)
New Total = 800 - y
New Long-Term = 560 - y

560 - y = .6 (800 - y)
y = 200

Answer: A
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Re: GMAT PREP (PS)   [#permalink] 02 Dec 2012, 21:28
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