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machines

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Intern
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machines [#permalink] New post 04 May 2009, 07:21
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

60% (01:51) correct 40% (00:00) wrong based on 7 sessions
Attachment:
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I am not sure about this,

can you explain the right answer?
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Re: machines [#permalink] New post 04 May 2009, 15:01
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1. What is the maximum number of pencils that could be produced by machine A? Machine A should operate the maximum time, 8 hours: 9000*8 = 72'000 pencils

2. What do we have for machine B? 100'000 - 72'000 = 28'000 pencils. It is the minimum number of pencils that could be produced by machine B and it will take 28'000 / 7'000 = 4 hours.

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Re: machines [#permalink] New post 06 May 2009, 00:28
machine A: 72,000pencils/8rs
B: 56,000pencils/8hrs

we only need 100,000 pencils so if A mazkes 72,000 then B only needs to make 28,000, which it can do in 4 hrs
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Re: machines [#permalink] New post 06 May 2009, 04:08
walker wrote:
1. What is the maximum number of pencils that could be produced by machine A? Machine A should operate the maximum time, 8 hours: 9000*8 = 72'000 pencils

2. What do we have for machine B? 100'000 - 72'000 = 28'000 pencils. It is the minimum number of pencils that could be produced by machine B and it will take 28'000 / 7'000 = 4 hours.


Seems so simple, thanks +1
Re: machines   [#permalink] 06 May 2009, 04:08
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