To build a road with a length of 4 kilometers, 3200 meters have been repaired, and the rest will be completed in 4 days. How many meters are repaired per day on average?
修一条长4千米的路，已经修好了3200米，剩下的需4天修完，平均每天修多少米？
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 - 3_200</gadget>
<output>800</output>

<gadget id="calculator">800 / 4</gadget>
<output>200</output>

<result>200</result>