$6$ typist working $5$ hours a day can type the manuscript of a book in $16$ days. How many days will $4$ typists take to do the same job, each working $6$ hrs a day?
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$6$ typist working $5$ hours a day can type the manuscript of a book in $16$ days. How many days will $4$ typists take to do the same job, each working $6$ hrs a day?