The engineering team builds a road, and repairs the full length (1/4) in the first month, and repairs 20% of the full length in the second month, and there is still 320 meters away from the middle point. How long is this road in meters?
工程队修建一条公路，第一个月修了全长的(1/4)，第二个月修了全长的20%，离中间点还有320米没有修．这条公路全长多少米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">320 / (1/20)</gadget>
<output>6_400</output>

<result>6_400</result>