To build a road, 35% of the total length was built in the first week, 3600 meters in the second week, and 400 meters away from (3/4) of the total length in two weeks. Find the total length of this road?
修一条路，第一周修了全长的35%，第二周修了3600米，两周修的距总长的(3/4)还有400米，求这条路的总长？
<gadget id="calculator">3_600 + 400</gadget>
<output>4_000</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(3/4) - (7/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4_000 / (2/5)</gadget>
<output>10_000</output>

<result>10_000</result>