The school participated in a group gymnastics performance. There were 4 people in front of Xiaoqiang and 4 people behind him. The number of people in each row is required to be equal. There are 630 people in the whole school. How many rows can they stand in?
学校参加团体操表演，小强的前面有4人，后面也有4人．要求每列人数相等，全校共有630人，可以站成多少列？
<gadget id="calculator">4 + 4 + 1</gadget>
<output>9</output>

<gadget id="calculator">630 / 9</gadget>
<output>70</output>

<result>70</result>