The fourth-grade students went to the museum in two batches, and each batch was exactly filled with five 40-seat cars. How many people are there in the fourth grade?
四年级同学分两批去博物馆参观，每批正好坐满5辆40座的汽车．四年级一共有多少人？
<gadget id="calculator">40 * 5 * 2</gadget>
<output>400</output>

<result>400</result>