How many days will it take four identical machines working together to do a job? (1)Each machine does of the job. (2)Two such machines can do the job in 8 days.

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How many days will it take four identical machines working together to do a job? (1)Each machine does <img alt='images' src='https://www.fatskills.com/images3/gmat/c0297-01.jpg'/> of the job. (2)Two such machines can do the job in 8 days.