A cement factory needs to produce 225 tons of cement, and 45 tons in 3 days. According to this progress, how many days will it take to complete the task?
某水泥厂要生产225吨水泥，3天生产45吨，照这样的进度，要多少天可以完成任务？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">225 / 15</gadget>
<output>15</output>

<result>15</result>