Mary put in a total of 16 1/2 hours mowing lawns during 5 days of the past week. How long was her average work day?


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On the average, a certain
light bulb is supposed to last 450 hours.  If it takes Mary an average
of 6 1/4 hours to read a novel, what is the maximum number of novels
Mary can expect to finish reading during the life of the bulb?


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