A batch of parts, A and B alone to complete, the ratio of time required is 3:5. Now two people cooperate, when completing the task, A processes 30 more parts than B, how many parts are there in this batch?
一批零件，甲、乙两人单独完成，所需的时间之比是3：5．现两人合作，完成任务时，甲比乙多加工30个，则这批零件有多少个？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>