James writes from 1 PM to 4 PM every night.  He can write 5 pages per hour.  How many weeks will it take to finish his 735-page book?
He writes for 4-1=<<4-1=3>>3 hours per day
That means he writes 3*5=<<3*5=15>>15 pages per day
So it would take him 735/15=<<735/15=49>>49 days
That means it will take 49/7=<<49/7=7>>7 weeks
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