The Hongxin Building Materials Store has 4,000 tons of cement, and after 4 days of transportation, there are still 800 tons left. How many tons are shipped on average per day?
宏信建材商店有水泥4000吨，运了4天后还剩下800吨，平均每天运多少吨？
<gadget id="calculator">4_000 - 800</gadget>
<output>3_200</output>

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

<result>800</result>