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Six machines, each working at the same constant rate, [#permalink]
06 Apr 2006, 14:24

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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?

This one is easy to solve, but I'm interested in finding out in how many different ways people can solve this. Please explain your answers.

I have a different approach.
If 6 machines do the work in 12 days,
to do the same work in 8 days you have to work 1.5 times as hard
meaning 6 x 1.5 = 9 machines