Two teams, A and B, work together to process a batch of parts. When the task is completed, group A processes (2/5) of this batch of parts. It is known that group A processes 55 per hour, and group B processes (3/5) of this batch of parts per hour. 20), how many parts are there in this batch?
甲、乙两个小组共同加工一批零件，完成任务时甲组加工这批零件的(2/5)，已知甲组每小时加工55个，乙组每小时加工这批零件的(3/20)，求这批零件有多少个？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/5) / (3/20)</gadget>
<output>4</output>

<gadget id="calculator">4 / (2/5)</gadget>
<output>10</output>

<gadget id="calculator">55 * 10</gadget>
<output>550</output>

<result>550</result>