The engineering team has built a highway, which has already built 35% of the total length, and will finish half of it after another 3 kilometers. How long is this road in meters?
工程队修一条公路，已经修了全长的35%，再修3千米就修完一半．这条公路全长是多少米？
<gadget id="calculator">50 / 100</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">3 / (3/20)</gadget>
<output>20</output>

<gadget id="calculator">20 * 1_000</gadget>
<output>20_000</output>

<result>20_000</result>