All the students in class 6 and 3 participated in the tree planting activity. When they gathered, they stood in 3 rows. The number of people in each row was exactly equal. Xiaojun stood in the first row. There were 7 people on his left and 7 people on his right. How many students are there in class 6 and 3? ．
六3班全体同学参加植树活动，集合时一共站了3排，每排人数正好相等，小军站在第一排，他左边有7人，右边也有7人，六3班一共有多少名学生．
<gadget id="calculator">7 + 7 + 1</gadget>
<output>15</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>