A road has been repaired for 80 kilometers, and the ratio of the repaired road to the total length of the railway is 1:8. How many kilometers are left to be repaired?
一条路已经修好了80千米，已经修的与铁路总长的比是1：8，还有多少千米没有修？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">80 / (1/8)</gadget>
<output>640</output>

<gadget id="calculator">640 - 80</gadget>
<output>560</output>

<result>560</result>