A road with a length of 5,700 meters has been built for a section, and there are still 900 meters left to be completed. If the road is built at 800 meters per day, how many days has it been repaired?
修一条长5700米的公路，已经修了一段，还剩下900米没有完成，如果按每天修800米路计算，已修了多少天？
<gadget id="calculator">5_700 - 900</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 / 800</gadget>
<output>6</output>

<result>6</result>