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Six machines, each working at the same constant rate,

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Six machines, each working at the same constant rate, [#permalink] New post 09 Feb 2007, 20:43
Six machines, 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?
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 [#permalink] New post 10 Feb 2007, 00:05
6 machines working together finish the task in 12 days.

6/x=1/12

x=72 days. 1 machine can complete the job in 72 days.

n*1/x=1/8

Substitute x=72 Solve and you get n=9

So 9 machines can complete the task in 8 days.
  [#permalink] 10 Feb 2007, 00:05
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Six machines, each working at the same constant rate,

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