The two masters and apprentices jointly processed a batch of parts, the apprentice processed 75 parts, and the master processed 16 parts three times less than the apprentice. How many pieces did the master process?
师徒两人共同加工一批零件，徒弟加工了75个，师傅加工的比徒弟的3倍少16个．师傅加工了多少个？
<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<gadget id="calculator">225 - 16</gadget>
<output>209</output>

<result>209</result>