The master and apprentice work together to process parts. The master takes 5 minutes to process one part, and the apprentice takes 9 minutes to process one part. When the task is completed, the master processes 108 parts, and how many parts does the apprentice process? (Answer in your favorite way)
师徒二人合作加工零件，师傅加工一个零件用5分钟，徒弟加工一个零件用9分钟，完成任务时，师傅加工零件108个，徒弟加工零件多少个？(用自己喜欢的方法解答)
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">108 * (5/9)</gadget>
<output>60</output>

<result>60</result>