The master processes 84 parts a day, and at the same time, the ratio of the number of parts processed by the master to the apprentice is 7:5. How many parts does the apprentice process in a day?
师傅一天加工零件84个，在相同的时间内，师傅和徒弟加工零件个数的比是7：5．徒弟一天加工零件多少个？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">84 * (5/7)</gadget>
<output>60</output>

<result>60</result>