30 tablets, three times a day, two tablets each time, how many days is enough for one bottle of medicine?
30片，每天吃三次，每次吃两片，一瓶药够吃几天？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<result>5</result>