For a rope, Uncle Wang cut off (1/4) of the total length for the first time, and (1/5) for the second time. It is known that the first time cut 4 meters more than the second time. How many meters is the rope?
一根绳子，王叔叔第一次剪去总长度的(1/4)，第二次剪去总长度的(1/5)，已知第一次比第二次多剪4米，这根绳子多少米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">4 / (1/20)</gadget>
<output>80</output>

<result>80</result>