The "Jinbao South Line" built by the people of Jinhu starts from Jinma Highway 331 and ends at the first section of the Beijing-Shanghai Expressway. The first phase repaired 1/2 of the total length, the second phase repaired 25% of the total length, leaving 12.5 kilometers unrepaired. How many kilometers is the total length of Jinbao South Line Highway?
金湖人民修建的"金宝南线"起于331省道金马公路，止于京沪高速公路界首段．第一期修了全长的(1/2)，第二期修了全长的25%，还剩12.5千米没有修．金宝南线公路全长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 - (1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12.5 / (1/4)</gadget>
<output>50</output>

<result>50</result>