A road is 800 meters long, and 15% of it has been repaired. How many meters are left to be repaired?
一条公路长800米，已经修了15%，还剩多少米没修？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">800 * (17/20)</gadget>
<output>680</output>

<result>680</result>