A road is built. The full length (2/5) is built on the first day. The second day is 30 meters shorter than the first day. There are 180 meters left to be repaired. What is the total length of this road in meters?
修一条路，第一天修了全长的(2/5)，第二天比第一天少修30米，还剩180米没有修，这条路全长多少米．
<gadget id="calculator">180 + 30</gadget>
<output>210</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 2</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">210 / (1/5)</gadget>
<output>1_050</output>

<result>1_050</result>