A rope, cut off its (2/5), exactly 8 meters, how many meters is left in this rope?
一根绳子，剪去它的(2/5)，正好剪去8米，这根绳子还剩下多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 / (2/5)</gadget>
<output>20</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<result>12</result>