To build a road, the full length (1/4) is built on the first day, and the rest (1/5) is repaired on the second day. At this time, there is still 120m left. How many meters is the total length of this road?
修一条路，第一天修了全长的(1/4)，第二天修了余下的(1/5)，这时还剩120m，这条路全长多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 / (4/5) / (3/4)</gadget>
<output>200</output>

<result>200</result>