The factory has produced a batch of parts, and the pass rate after inspection is 95%, and 25 parts are defective. How many parts are there in this batch?
工厂生产了一批零件，经检验合格率是95%，有25个是次品．这批零件有多少个？
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">25 / (1/20)</gadget>
<output>500</output>

<result>500</result>