The worker uncle built a road. He built three-tenths of the total length on the first day and five-tenths of the total length on the second day. There were still 200 meters left to be repaired. How long is this road?
工人叔叔修一条路，第一天修了全长的十分之三，第二天修了全长的十分之五，还剩下200米没有修．这条路有多少长？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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

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

<result>1_000</result>