The master and the apprentice jointly process 180 parts, the master has 30 more parts than the apprentice four times, how many parts does the apprentice process?
师傅和徒弟共同加工零件180个，师傅比徒弟的4倍多30个，徒弟加工多少个零件？
<gadget id="calculator">180 - 30</gadget>
<output>150</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<result>30</result>