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Six machiens, each working at the same constant rate,

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Six machiens, each working at the same constant rate, [#permalink] New post 17 Sep 2006, 13:55
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Six machiens, each working at the same constant rate, together can complete a certain job in 12 days. How many additional machines, each working at the same constant rate, will be needed to complete the job in 8 days?

A. 2
B. 3
C. 4
D. 6
E. 8
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 [#permalink] New post 17 Sep 2006, 19:38
If 6 machines takes 12 days
to complete the same work in 8 days we nedd12/8 x 6 = 9 machines

So 3 machines are needed additionally.
So B is the answer.

Hey Buddy, this is a simple question. Please go through the basics of every topic. I think then only u can understand most of the questions posted here in this forum
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Averages Accelerated:Guide to solve Averages Quickly(with 10 practice problems)

  [#permalink] 17 Sep 2006, 19:38
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