A cartoon is 420 minutes, two episodes are played every day, each episode is 15 minutes, how many days can you watch it.
一部动画片420分钟，每天播放两集，每集15分钟，多少天可以看完．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">420 / 30</gadget>
<output>14</output>

<result>14</result>