A Chinese patent medicine has 300 capsules. If you take 15 capsules each time, twice a day, how many days can you take these medicines?
一种中成药有300粒，如果每次吃15粒，每天吃2次，这些药能吃多少天．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">300 / 30</gadget>
<output>10</output>

<result>10</result>