15 teachers took 129 students to the autumn tour, if each car can accommodate 36 people, how many cars are needed in total?
15个老师带了129名学生去秋游，如果每辆车坐36人，一共需要多少辆车？
<gadget id="calculator">129 + 15</gadget>
<output>144</output>

<gadget id="calculator">144 / 36</gadget>
<output>4</output>

<result>4</result>