On Children's Day, the school held a variety of activities, among which the students were most interested in the ring-drilling game. The game requires the same number of participants in each class. The first class has 15 people in each row, there are 4 rows, and the second class has 6 people in each row, how many rows in total?
六一儿童节学校举行了丰富多彩的活动，其中钻圈圈游戏学生最感兴趣．游戏要求每班参赛人数相同．一班每行15人，有4行，二班每行6人，一共几行？
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<result>10</result>