Bill had to finish a project from work that was to take him 4 days. If he took 6 seven-hour naps in the four days, how long did he spend working on the project?
How many hours was the project to take? ** Since a day has 24 hours, the project was to take 24*4 = <<24*4=96>>96 hours.
How many hours did Bill take naps? ** Bill took 6 seven-hour naps during the four days, a total of 6*7 = <<6*7=42>>42 hours
How many hours did Bill spend working on the project? ** The time he spent working on the project is 96-42 = <<96-42=54>>54 hours.
#### 54