If you're asking if Mary worked 6 1/2 hours total out of the 5 days that it would be 1 hour and 18 minutes. If your asking how many hours she worked every day with 6 1/2 hours it would be 32 hours and 30 minutes.
If this fraction is closer to one it will be close to 16/16. And since 8 is half of 16, any fraction that is around 8/16 is closer to 1/2. 15 is closer 16 so this fraction is closer to one.
