A batch of automobile engines, unqualified products account for (1/20) of this batch of engines, what is the qualified rate of this batch of engines?
一批汽车额发动机，不合格的产品占这批发动机的(1/20)，这批发动机的合格率是多少？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>