An engineering team wanted to build a 450-meter-long canal, and 150 meters were built in the first 3 days. Calculated at this speed, how many days will it take to finish the rest?
一个工程队要修一条450米长的水渠，前3天修了150米．照这样的速度计算，其余的要多少天可以修完？
<gadget id="calculator">450 - 150</gadget>
<output>300</output>

<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">300 / 50</gadget>
<output>6</output>

<result>6</result>