A book has pages pages and you read per_day a day. Write days_to_finish(pages, per_day) to return how many days it takes. A last short day still counts as a day; 0 pages takes 0 days.
days_to_finish(100, 30)→4days_to_finish(90, 30)→3def days_to_finish(pages, per_day):
days = pages // per_day
# your code here: if some pages are left, add one more day
return days
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