Jon's laundry machine can do 5 pounds of laundry at a time.  4 shirts weigh 1 pound and 2 pairs of pants weigh 1 pound.  If he needs to wash 20 shirts and 20 pants, how many loads of laundry does he have to do?
The shirts weigh 20/4=
<gadget id="calculator">20/4</gadget>
<output>5</output>
5 pounds.
The pants weigh 20/2=
<gadget id="calculator">20/2</gadget>
<output>10</output>
10 pounds.
So he needs to do 10+5=
<gadget id="calculator">10+5</gadget>
<output>15</output>
15 pounds of laundry.
So that would take 15/5=
<gadget id="calculator">15/5</gadget>
<output>3</output>
3 loads of laundry.

<result>3</result>