There is a pile of sand and gravel weighing 50 tons, 18 tons have been transported away, and the rest is transported by a truck with a load capacity of 4 tons. How many such trucks are needed to transport it all at once?
有一堆重50吨的沙石，已经运走了18吨，剩下的用载质量为4吨的卡车来运，需要几辆这样的卡车才能一次运完？
<gadget id="calculator">50 - 18</gadget>
<output>32</output>

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

<result>8</result>