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machines

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Intern
Joined: 13 Apr 2009
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machines [#permalink]  04 May 2009, 07:21
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Difficulty:

(N/A)

Question Stats:

60% (01:51) correct 40% (00:00) wrong based on 7 sessions
Attachment:

37.png [ 18.9 KiB | Viewed 2738 times ]

can you explain the right answer?
CEO
Joined: 17 Nov 2007
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Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Re: machines [#permalink]  04 May 2009, 15:01
2
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Expert's post
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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Director
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Re: machines [#permalink]  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
Director
Joined: 27 Jun 2008
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WE 1: Investment Banking - 6yrs
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Re: machines [#permalink]  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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