Use a batch of cloth to process clothes. If you use it to make tops, you can make 20 pieces; How many sets of processing sets?
用一批布加工服装，若用它来做上装，可做20件，若用它做裤子，可做30件，现在用这批布先做了5条裤子，剩下的加工成套装，可加工套装多少套？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 5</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) + (1/30)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(5/6) / (1/12)</gadget>
<output>10</output>

<result>10</result>