A batch of parts, unqualified products are qualified products (1/19), what is the qualified rate of this batch of products.
一批零件，不合格产品是合格产品的(1/19)，这批产品的合格率是多少．
<gadget id="calculator">19 / 1</gadget>
<output>19</output>

<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">19 / 20</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

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

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