The engineering team made a road, the first week to make the full length (1/5), the second week to make the full length (1/4), a total of 180 meters in two weeks. How long is this road in meters?
工程队做一条公路，第一周做了全长的(1/5)，第二周做了全长的(1/4)，两周共做了180米．这条公路全长多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">180 / (9/20)</gadget>
<output>400</output>

<result>400</result>