The school cafeteria bought 850 kg of rice, and after transporting it to school by car for 3 cars, there was 100 kg left. How many kg per car on average?
学校食堂买了大米850㎏，用车往学校运了3车后，还剩100kg．平均每车运多少kg？
<gadget id="calculator">850 - 100</gadget>
<output>750</output>

<gadget id="calculator">750 / 3</gadget>
<output>250</output>

<result>250</result>