A batch of parts is equally distributed to the master and the apprentice for processing. When the master completes (3/4) of the task, the apprentice completes (4/5) of the task. At this time, the master makes 60 fewer parts than the apprentice. How many parts are there in this batch?
一批零件平均分给师徒两人加工，当师傅完成任务的(3/4)时，徒弟完成了任务的(4/5)，这时师傅比徒弟少做60个．这批零件共有多少个？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">60 / (1/20)</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 * 2</gadget>
<output>2_400</output>

<result>2_400</result>