John uses the bathroom every 50 minutes.  How many times does he use the bathroom during a 2.5-hour movie?
The movie last 2.5*60=
<gadget id="calculator">2.5*60</gadget>
<output>150</output>
150 minutes.
So he uses the bathroom 150/50=
<gadget id="calculator">150/50</gadget>
<output>3</output>
3 times.

<result>3</result>