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Director
Director
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Joined: 03 Sep 2006
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PS-prep [#permalink] New post 23 Jun 2007, 23:46
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A
B
C
D
E

Difficulty:

(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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Director
Director
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Joined: 09 Aug 2006
Posts: 767
Followers: 1

Kudos [?]: 52 [0], given: 0

 [#permalink] New post 24 Jun 2007, 02:33
To minimize the number of hrs. that machine B works, we should use the maximum hours that machine A can work,i.e., 8 hours.

Work = Rate * Time

For A:
Rate = 9000 pencils/hr
Time = 8hrs
Work = 72000 pencils

Pencils that remained to be produced = 100000-72000 = 28000

For B:
Rate = 7000 pencils/hr
Work = 28000 pencils
Time = 28000/7000 = 4hrs

The answer according to me should be A. Is this correct?
  [#permalink] 24 Jun 2007, 02:33
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