To build a road, 15% of the road was repaired on the first day, and 30% was repaired on the second day. There are still 220 meters left to be repaired. How many meters is this road in total?
修一条公路，第一天修了15%，第二天修了30%，还剩下220米没有修，这条公路一共多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) + (3/10)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">220 / (11/20)</gadget>
<output>400</output>

<result>400</result>