It is planned to assign the task of processing a batch of parts to A, B, and C. If A and B work together, A will make 120 pieces when it is completed; if B and C work together, B will make 160 pieces when it is completed. It is known that the work efficiency of B is 1.5 times that of A, how many parts are there in this batch?
计划把加工一批零件的任务分给甲乙丙三人．如果是甲乙两人合作，完成时，甲做120个；如果是乙丙两人合作，完成时，乙做160个．已知乙的工效是甲的1.5倍，这批零件共多少个？
<gadget id="calculator">120 * 1.5</gadget>
<output>180</output>

<gadget id="calculator">180 + 120</gadget>
<output>300</output>

<result>300</result>