For a batch of parts, Master Wang alone needs 9 hours to complete, and Master Li makes 20 per hour. Now that the two are working together, Master Wang made this batch of parts (5/9) when it was completed. How many parts did Master Li make?
一批零件，王师傅单独做需要9小时完成，李师傅每小时做20个．现在两人合作，完成时王师傅做了这批零件的(5/9)，李师傅做了多少个零件？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(5/9) / (1/9)</gadget>
<output>5</output>

<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<result>100</result>