road in Zhangjia Village was built. In the first month, 20% of the total length was repaired. In the second month, 30 meters more than the first month was repaired. There are still 90 meters left to be repaired. How long is the total length of this road?
张家村修一条公路，第一月修了全长的20%，第二月比第一月多修30米，还剩下90米没有修，这条公路全长多少米？
<gadget id="calculator">30 + 90</gadget>
<output>120</output>

<gadget id="calculator">1 - 0.4</gadget>
<output>0.6</output>

<gadget id="calculator">120 / 0.6</gadget>
<output>200</output>

<result>200</result>