A total of 42 tons of fruit were picked from an orchard, and 12 tons were transported away. The rest will be transported at once by a truck with a load of 5 tons. How many of these vans are needed?
一个果园摘下果子共42吨，运走了12吨．剩下的用载重5吨的货车一次运完．需要几辆这样的货车？
<gadget id="calculator">42 - 12</gadget>
<output>30</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>