A team dug a canal with a length of 3.66 kilometers. The first 6 days dug an average of 0.25 kilometers per day, and then an average of 0.54 kilometers per day. How many days will it take to complete the canal? (solution in two ways)
某队挖一条长3.66千米的水渠，前6天平均每天挖0.25千米，以后平均每天挖0.54千米，挖完这条水渠共需多少天？(用两种方法解)
<gadget id="calculator">6 * 0.54</gadget>
<output>3.24</output>

<gadget id="calculator">6 * 0.25</gadget>
<output>1.5</output>

<gadget id="calculator">3.66 - 1.5</gadget>
<output>2.16</output>

<gadget id="calculator">3.24 + 2.16</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 / 0.54</gadget>
<output>10</output>

<result>10</result>