Students from 4 classes in the third grade went out to participate in the "I Love Science" activity together. Each class was divided into 5 groups on average, with 16 students in each group. How many people in the third grade participated in the activity?
三年级4个班同学，一起外出参加"我爱科学"活动，每个班平均分成5组，每组16人，三年级一共有多少人参加活动？
<gadget id="calculator">16 * 5 * 4</gadget>
<output>320</output>

<result>320</result>