The worker, Master Li, can produce a batch of parts by working 6 hours a day and 12 days. At this speed, how many days can it be completed by working 8 hours a day? (Solve with ratio)
工人李师傅生产一批零件，每天工作6小时12天可以完成，照这样的速度，每天工作8小时，多少天可以完成？(用比例解)
<gadget id="calculator">6 * 12</gadget>
<output>72</output>

<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<result>9</result>