To build a road, the full length (2/5) was built on the first day, and 25% of the full length was repaired on the second day, leaving 1400 meters left to be repaired. How long is this road in meters?
修一条公路，第一天修了全长的(2/5)，第二天修了全长的25%，还剩下1400米没修．这条公路全长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1_400 / (7/20)</gadget>
<output>4_000</output>

<result>4_000</result>