The master and apprentice worked together to process a batch of parts, and the two worked together for 3 hours to process a total of 216 parts. It is known that the work efficiency ratio of the master to the apprentice is 5:4, how many parts does the apprentice process per hour?
师傅和徒弟共同加工一批零件，两人合做了3小时共加工了216个．已知师傅与徒弟的工作效率比是5：4，徒弟每小时加工零件多少个？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">216 / 9</gadget>
<output>24</output>

<gadget id="calculator">24 * 4</gadget>
<output>96</output>

<gadget id="calculator">96 / 3</gadget>
<output>32</output>

<result>32</result>