A section of road was built, 20% of the total length was repaired on the first day, and 450m remained unrepaired. How many meters is the total length of this section of road?
修一段路，第一天修了全长的20%，还剩下450m没有修，这段路全长多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">450 / (4/5)</gadget>
<output>1_125/2 = around 562.5</output>

<result>1_125/2 = around 562.5</result>