48 people form a square, the number of people on each side is equal, how many people are on each side.
48个人围成一个正方形，每边上的人数相等，每条边上有多少人．
<gadget id="calculator">48 + 4</gadget>
<output>52</output>

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

<result>13</result>