A wire is cut off by 20%, and there are 60 meters left. How long is the wire originally?
一根电线，截去20%，还剩60米，这根电线原来长多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 / (4/5)</gadget>
<output>75</output>

<result>75</result>