UPSKILL MATH PLUS

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15 typists working 7 hours a day can finish typing a book in 26 days. How many days will it take to finish a book if 8 typists working 3 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)