Hexi Village needs to build a 540-meter-long canal, and 108 meters have been built in the first 3 days. According to this calculation, how many days will it take to complete the construction of this canal?
河西村要修一条540米长的水渠，前3天已经修了108米．照这样计算，修完这条水渠一共要用多少天？
<gadget id="calculator">108 / 3</gadget>
<output>36</output>

<gadget id="calculator">540 / 36</gadget>
<output>15</output>

<result>15</result>