To build a road, in the first week, 300 meters of the total length (4/9) was repaired, and the remaining 200 meters were not repaired. How long is the total length of this road?
修建一条公路，第一周修了全长的(4/9)多300米，余下200米未修，这条公路全长多少米？
<gadget id="calculator">300 + 200</gadget>
<output>500</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">500 / (5/9)</gadget>
<output>900</output>

<result>900</result>