If a square with a perimeter of 16 decimeters is equally divided into two rectangles, what is the perimeter of each rectangle in decimeters?
将一个周长是16分米的正方形平均分成两个长方形，每个长方形的周长是多少分米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<result>12</result>