A rope, 60% of its total length is cut off, leaving 12 meters. How long is the rope?
一条绳子，剪去全长的60%，还剩下12米，原来绳子长多少米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>