Saturday, October 16, 2010

6 machines each working at the same constant rate together can complete a job in 12 days

6 machines each working at the same constant rate together can complete a 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?
As N







6/x+6 = 8/12 i.e. x = 3

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