The fruit company purchased 42 tons of apples in total, and 22 tons were shipped away first. The rest will be transported at once with a 4-ton truck. How many of these trucks are needed?
果品公司一共收购苹果42吨，先运走22吨．剩下的用载重用4吨的卡车一次运完．需要多少辆这样的卡车？
<gadget id="calculator">42 - 22</gadget>
<output>20</output>

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

<result>5</result>