A canal was built in Honghua Village. The full length (2/5) was repaired by 10 meters in the first week, and the full length (1/4) was repaired by 5 meters in the second week, leaving 282 meters left unrepaired. How many meters is this canal?
红花村修一条水渠，第一周修了全长的(2/5)多10米，第二周修了全长的(1/4)少5米，还剩下282米没有修．这条水渠长多少米？
<gadget id="calculator">282 - 5</gadget>
<output>277</output>

<gadget id="calculator">10 + 277</gadget>
<output>287</output>

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

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

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">287 / (7/20)</gadget>
<output>820</output>

<result>820</result>