A rope, the first cut off the full length (1/5), the second cut off the full length (1/4), there are 11 meters left, how many meters is the total length of this rope?
一根绳，第一次剪去了全长的(1/5)，第二次剪去了全长的(1/4)，还剩下11米，这根绳全长多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">11 / (11/20)</gadget>
<output>20</output>

<result>20</result>