Janice's office is on the third floor, and she has to walk up 3 flights of stairs to get to her office.  In a single day, she goes up the three flights of stairs 5 times, down the the three flights of stairs 3 times, and uses the elevator the remainder of the time.  How many flights of stairs does Janice walk (up and down) in a single day?
Janice walks up 3 flights of stairs 5 times per day, for a total of 3*5 = 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15 flights of stairs.
Janice walks down 3 flights of stairs 3 times per day, for a total of 3*3 = 
<gadget id="calculator">3*3</gadget>
<output>9</output>
9 flights of stairs.
In total, she walks 15+9=
<gadget id="calculator">15+9</gadget>
<output>24</output>
24 flights of stairs in a single day.

<result>24</result>