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?
Since a day has 24 hours, the project was to take 24*4 = 
<gadget id="calculator">24*4</gadget>
<output>96</output>
96 hours.
Bill took 6 seven-hour naps during the four days, a total of 6*7 = 
<gadget id="calculator">6*7</gadget>
<output>42</output>
42 hours.
The time he spent working on the project is 96-42 = 
<gadget id="calculator">96-42</gadget>
<output>54</output>
54 hours.

<result>54</result>