A factory purchased 800 tons of iron ore from the mine, and 768 tons have already been shipped. The rest wants to be transported by trucks with a load of 8 tons, and they can be transported at one time. How many such trucks do they need to prepare?
一工厂从矿山购进铁矿石800吨，已经运来了768吨，剩下的想用载重8吨的卡车来运，并一次运完，问需要准备多少辆这样的上车？
<gadget id="calculator">800 - 768</gadget>
<output>32</output>

<gadget id="calculator">32 / 8</gadget>
<output>4</output>

<result>4</result>