48 students play a game. Everyone forms a square with equal number of people on each side. There are people on all four vertices. How many students are there on each side?
48名学生做游戏，大家围成一个正方形，每边人数相等，四个顶点都有人，每边各有多少名学生．
<gadget id="calculator">48 + 4</gadget>
<output>52</output>

<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<result>13</result>