A section of road is 800m long, and 450m has been repaired. What percentage of the total length is the unrepaired part?
一段路长800m，已经修了450m，未修的占全长的百分之几？
<gadget id="calculator">800 - 450</gadget>
<output>350</output>

<gadget id="calculator">350 / 800</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>