PDF chapter test TRY NOW

16 typists working 7 hours a day can finish typing a book in 25 days. How many days will it take to finish a book if 9 typists working 4 hours a day? (Determine the value using formula method).
 
The number of days is
 
(Note: Submit the answer as whole number. If the answer is not a whole number, round off and submit the answer)