The master and the apprentice processed a batch of parts together. On the first day, the master processed 18% of the total, and the apprentice processed 12% of the total. A total of 300 parts were processed. How many parts are there in total?
师徒两人共同加工一批零件，第一天师傅加工了总数的18%，徒弟加工了总数的12%，一共加工了300个．这批零件一共有多少个？
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">18 / 100</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">(3/25) + (9/50)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">300 / (3/10)</gadget>
<output>1_000</output>

<result>1_000</result>