A piece of rope, 75% of the total length is cut off, leaving 12 meters. How long is the rope?
一条绳子，剪去全长的75%，还剩下12米，原来绳子长多少米？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 / (1/4)</gadget>
<output>48</output>

<result>48</result>