To build a road, the full length (1/5) has been built, and there is still 800 meters left to be repaired. How many meters is the total length of this road?
修一条公路，已修了全长的(1/5)，还剩下800米没修，这条公路全长多少米？
<gadget id="calculator">1 / 5</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">800 / (4/5)</gadget>
<output>1_000</output>

<result>1_000</result>