A total of 32 tons of apples were purchased, and 12 tons were transported away first, and the remaining trucks with a load capacity of 4 tons were transported at one time. How many such trucks are needed?
一共收购了32吨苹果，先运走12吨，剩下的用载质量为4吨的卡车一次运完，需要几辆这样的卡车？
<gadget id="calculator">32 - 12</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>