Village A and Village B jointly build a road. A has repaired 30% of the total length, B has repaired 450 meters, and the remaining half has not been repaired. How long is the total length of this road?
甲村和乙村合修一条公路，甲修了全长的30%，乙修了450米，还剩下一半没修，这条公路全长多少米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">450 / (1/5)</gadget>
<output>2_250</output>

<result>2_250</result>