A highway has been repaired for 147 kilometers, leaving 30% unrepaired. How long is this road in kilometers?
一条公路已经修好147千米，还剩下30%没有修．这条公路全长多少千米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">147 / (7/10)</gadget>
<output>210</output>

<result>210</result>