The engineering team wants to build a 1,600-meter-long road, and the road is built 45 meters a day. It has been repaired for 20 days. How many meters of road are left to be repaired?
工程队要修一条1600米长的公路，每天修路45米，已经修了20天，还剩多少米公路没有修？
<gadget id="calculator">45 * 20</gadget>
<output>900</output>

<gadget id="calculator">1_600 - 900</gadget>
<output>700</output>

<result>700</result>