The municipal company repaired a road, repaired 30% of the total length on the first day, and repaired 200 meters on the second day, which is exactly half of the total length. How long is this road in meters?
市政公司维修一条路，第一天维修了全长的30%，第二天修了200米，这是正好修了全长的一半．这条路全长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">200 / (1/5)</gadget>
<output>1_000</output>

<result>1_000</result>