To build a road, the entire length (1/5) of the road was repaired in the first month, and 25% of the entire length was repaired in the second month. At this time, the distance to the midpoint of the road is still 5 kilometers away. How many kilometers is the total length of the road? ?
修一条公路，第一个月修了全程的(1/5)，第二个月又修了全程的25%，这时距离公路的中点还有5千米，这条公路全长有多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/2) - (1/5) - (1/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 / (1/20)</gadget>
<output>100</output>

<result>100</result>