A bundle of wires is 60% used, and exactly 120 meters are used, how many meters are left?
一捆电线，用了60%，正好用了120米，还剩多少米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 / (3/5)</gadget>
<output>200</output>

<gadget id="calculator">200 - 120</gadget>
<output>80</output>

<result>80</result>