When digging a canal, we dug 3.2 kilometers on the first day, 0.65 kilometers more than the second day, and there were 2.05 kilometers left to be dug. How long is this canal in meters?
挖一条水渠，第一天挖了3.2千米，比第二天多挖了0.65千米，还剩下2.05千米没有挖，这条水渠全长多少米？
<gadget id="calculator">3.2 - 0.65</gadget>
<output>2.55</output>

<gadget id="calculator">2.55 + 3.2 + 2.05</gadget>
<output>7.8</output>

<result>7.8</result>