35% of the total length of a road has been repaired. If another 60 meters are repaired, the ratio of the repaired to the unrepaired is 1:1. How long is this road?
修一条公路，已修了全长的35%，如果再修60米，那么已修的和未修的比是1：1，这条公路有多长？
<gadget id="calculator">1 / 1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">60 / (3/20)</gadget>
<output>400</output>

<result>400</result>