The school organizes tree planting labor, with an average of 24 trees planted per person. There are 42 students in the first class and 38 students in the second class. How many trees are planted in the two classes?
学校组织植树劳动，平均每人植树24棵．一班有学生42人，二班有学生38人，两个班一共植树多少棵？
<gadget id="calculator">42 + 38</gadget>
<output>80</output>

<gadget id="calculator">80 * 24</gadget>
<output>1_920</output>

<result>1_920</result>