The students went to visit. There were 3 batches of students in the morning, 169 people in each batch, and 213 people in the afternoon. How many students visited in total on this day?
同学们去参观，上午去了3批学生，每批169人，下午有213人参观，这一天一共有多少学生参观？
<gadget id="calculator">169 * 3</gadget>
<output>507</output>

<gadget id="calculator">507 + 213</gadget>
<output>720</output>

<result>720</result>