Guangming Primary School carried out campus renovation and rebuilt the school's fence. On the first day, 20 meters were repaired, which is exactly 25% of the total length of the fence. How many meters is the school's fence to be rebuilt?
光明小学进行校园改造，对学校的围墙进行重修，第一天修了20米，正好是围墙总长度的25%，学校要重修的围墙一共多少米．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<result>80</result>