The school organized a visit to the Science and Technology Museum. There were 213 students visiting in the morning and 3 batches of students visiting in the afternoon, with 169 students in each batch. How many students came to visit this day?
学校组织参观科技馆，上午参观的学生有213人，下午有3批学生来参观，每批169人．这一天一共有多少学生来参观？
<gadget id="calculator">169 * 3</gadget>
<output>507</output>

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

<result>720</result>