workshop plans to complete a batch of parts processing tasks in 5 days. On the first day, (1/5) more than 20 parts of this batch of parts are processed, and on the second day, the remaining (1/4) more than 15 parts are processed. The remaining (1/3) was processed in three days with 10 less pieces, the remaining (1/2) was processed with 5 more pieces in the fourth day, and the last 20 pieces were processed in the fifth day. How many parts are there in this batch of parts? ?
一个车间计划用5天完成一批零件加工的任务，第一天加工了这批零件的(1/5)多20个，第二天加工了剩下的(1/4)多15个，第三天加工了剩下的(1/3)少10个，第四天加工了剩下的(1/2)多5个，第五天加工了最后的20个，这批零件总数有多少个？
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / (1/2)</gadget>
<output>50</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">40 / (2/3)</gadget>
<output>60</output>

<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">75 / (3/4)</gadget>
<output>100</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 / (4/5)</gadget>
<output>150</output>

<result>150</result>