Mike gets paid 100 dollars a week.  He decides to spend half of that at an arcade.  He spends 10 dollars at the arcade on food and uses the rest on arcade tokens. He can play for 1 hour for $8. How many minutes can he play?
He spent 100*.5=$
<gadget id="calculator">100*.5</gadget>
<output>50</output>
50 at the arcade.
He uses 50-10=$
<gadget id="calculator">50-10</gadget>
<output>40</output>
40 on tokens.
He can play 40/8=
<gadget id="calculator">40/8</gadget>
<output>5</output>
5 hours.
There are 60 minutes in an hour so he can play 5*60=
<gadget id="calculator">5*60</gadget>
<output>300</output>
300 minutes.

<result>300</result>