The Hongqi workshop produced a batch of parts in three days, 1/5 of the total number was produced on the first day, 20 more than the first day were produced on the second day, and 55 were produced on the third day. How many parts are there in this batch?
红旗车间三天生产了一批零件，第一天生产了总数的(1/5)，第二天比第一天多生产20个，第三天生产了55个．这批零件共有多少个？
<gadget id="calculator">20 + 55</gadget>
<output>75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">75 / (3/5)</gadget>
<output>125</output>

<result>125</result>