Build a canal with a total length of 24 kilometers. 1.5 kilometers were repaired in 3 days after starting work. According to this calculation, how many days will it take to complete the canal?
修一条水渠，总长24千米．开工3天修了1.5千米．照这样计算，修完这条水渠还要多少天？
<gadget id="calculator">24 - 1.5</gadget>
<output>22.5</output>

<gadget id="calculator">1.5 / 3</gadget>
<output>0.5</output>

<gadget id="calculator">22.5 / 0.5</gadget>
<output>45</output>

<result>45</result>