To dig a drainage ditch, the full length (1/4) was dug on the first day, and the full length (1/5) was dug on the second day, leaving 132 meters. How long is this drainage ditch?
挖一条排水沟，第一天挖了全长的(1/4)，第二天挖了全长的(1/5)，还剩下132米，这条排水沟长多少米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">132 / (11/20)</gadget>
<output>240</output>

<result>240</result>