At Snowflake Plastics, each employee gets 10 sick days and 10 vacation days per year.  If Mark uses half his allotment of both types of days in a year, how many hours' worth of days does he have left if each day covers an 8-hour long workday?
First, we add the two types of days together to find 10+10=
<gadget id="calculator">10+10</gadget>
<output>20</output>
20 days in total between the two types.
We then divide this number in half to find Mark's remaining number of days, getting 20/2= 
<gadget id="calculator">10</gadget>
<output>10</output>
10 days remaining.
Since each day counts as 8 hours, we multiply 10*8= 
<gadget id="calculator">10*8</gadget>
<output>80</output>
80 hours' worth of days remaining for Mark.

<result>80</result>