A rope, 20% of the total length is cut off for the first time, 25% of the total length is cut off for the second time, and 5 meters more than the first time, how long is the rope?
一根绳子，第一次剪去总长的20%，第二次剪去总长的25%，第二次比第一次多剪去5米，这根绳子长多少米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</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">5 / (1/20)</gadget>
<output>100</output>

<result>100</result>