The apprentice processes 38 parts per hour, and the master processes 20 parts less than twice as many as the apprentice. How many parts does the master process per hour?
徒弟每小时加工零件38个，师傅比徒弟的2倍少20个，师傅每小时加工多少个？
<gadget id="calculator">38 * 2</gadget>
<output>76</output>

<gadget id="calculator">76 - 20</gadget>
<output>56</output>

<result>56</result>