A batch of parts is distributed to three workshops A, B, and C for processing. On average, each worker has to process 20 pieces, and each worker has to process 30 pieces separately. If the processing task of this batch of parts is , First, each of the two workshops A and C makes 12 on average. All the rest will be done by workshop B. On average, how many parts does each worker need to process to complete the task on time?
一批零件，分给甲、乙、丙三个车间去做，平均每个工人要加工20个，单独分给乙车间去做，平均每个工人要加工30个，如果将这批零件加工任务，先由甲、丙两个车间平均每人做12个．剩下的全部由乙车间去做，平均每个工人要加工多少个零件才能按时完成任务？
<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/3) / (1/3)</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 20</gadget>
<output>24</output>

<result>24</result>