For a road, 40% of the road was repaired in the first week, 252 meters in the second week, and 85% of the road was repaired in two weeks. How long is the road in meters?
一条路，第一周修了40%，第二周修了252米，两周共修了这条路的85%，这条路全长多少米？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(17/20) - (2/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">252 / (9/20)</gadget>
<output>560</output>

<result>560</result>