batch of parts is processed by two masters and apprentices. It is known that the workload of the master in 3 hours is exactly equal to the workload of the apprentice in 4 hours. As a result, the two people cooperate to complete all the parts in 6 hours. At this time, the master made 480 pieces. How many parts are there in this batch? ?
一批零件由师徒2人加工，已知师傅3小时的工作量恰好等于徒弟4小时的工作量，结果2人合作6小时全部完成，这时师傅做了480个，这批零件共有多少个？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">480 * (3/4)</gadget>
<output>360</output>

<gadget id="calculator">360 + 480</gadget>
<output>840</output>

<result>840</result>