A production team needs to process a batch of parts and complete the task in two days. On the first day, 85% of the total number is processed less than 6 pieces, which is exactly equivalent to 4 times that of the second day. How many parts are there in this batch?
一个生产小组要加工一批零件，两天完成任务，第一天加工了总数的85%少6个，正好相当于第二天的4倍，这批零件一共有多少个？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(17/20) - (4/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">6 / (1/20)</gadget>
<output>120</output>

<result>120</result>