John worked 8 hours a day every day from the 3rd to the 8th, including the 3rd and not including the 8th.  How many hours did he work?
How many days did John work? ** He worked for 8-3=<<8-3=5>>5 days
How many hours did John work? ** So he worked for 5*8=<<5*8=40>>40 hours
#### 40