The master and apprentice worked together to process 360 parts. The apprentice worked for 6 hours, processing 25 parts per hour, and the master processed the rest by himself for 7 hours. How many parts does the master process per hour?
师徒两人合作加工360个零件，徒弟工作了6小时，每小时加工25个，剩下的由师傅独自加工7小时才完成．师傅每小时加工多少个零件？
<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">360 - 150</gadget>
<output>210</output>

<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<result>30</result>