The engineering team repairs a road, repairing 45 meters per day, and can complete the task in 20 days. In fact, 200 meters were repaired in the first 4 days. According to this calculation, how many days can the task be completed? (answer with ratio)
工程队修一条路，每天修45米，20天可以完成任务．实际前4天修了200米，照这样计算，多少天可以完成任务？(用比例解答)
<gadget id="calculator">45 * 20</gadget>
<output>900</output>

<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">900 / 50</gadget>
<output>18</output>

<result>18</result>