If a rope is cut off by 2/5 of its total length, exactly 8 meters are cut off. How long is the rope in meters?
一根绳子截去全长的(2/5)正好截去8米，这根绳子长多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<result>20</result>