Both master and apprentice process the same number of parts. When the master completes (1/2), the apprentice completes 120. When the master completes the task and the apprentice completes (4/5), how many parts do the master and the apprentice each need to process?
师徒俩人加工同样多的零件．当师傅完成了(1/2)时，徒弟完成了120个．当师傅完成了任务时，徒弟完成了(4/5)，则师傅和徒弟各有多少个零件需要加工？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / (4/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">120 * (5/2) * 2</gadget>
<output>600</output>

<result>600</result>