Process a batch of parts, 25% more than 20 of these parts have been processed. The ratio of processed parts to unprocessed parts is 3:5. How many parts are in this batch?
加工一批零件，已经加工这批零件的25%多20个．已经加工的零件与未加工的比是3：5，这批零件是多少个．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">20 / (1/8)</gadget>
<output>160</output>

<result>160</result>