A class selected some students to participate in the 2004 "June 1" International Children's Day parade performance. If they are arranged in a square matrix (solid), there will be 7 more people; if each row and column is added by one row, there will be 4 fewer people. What is the number of these students.
某班抽出一些学生参加2004年"六一"国际儿童节队列表演．如果排成一个正方形方阵(实心)，就多出7人；如果每行每列都增加一排，就少4人．这些学生的人数是多少．
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 + 7</gadget>
<output>32</output>

<result>32</result>