6. If 4 typists work 6 hours a day, they can type a book in 20 days. How many days will 2 typists take to do same job,if each work 8 hours a day
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Equivalent hours worked by 4 typists in a day=4×6=24 hours.
Total hours needed to type a book= (no. of days×hours worked in a day)=20×24=480 hours.
Now, equivalent hours worked by 2 typists working 8 hours= 2×8=16 hours.
Hours required to type a book = 480 = no. of days× hours per day.
480=days× 16
No. of days= 30 days.
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