It is known that the perimeter of a square is equal to that of a rectangle. The length of this rectangle is 16 decimeters and twice its width. What is the area of this square?
已知一个正方形与一个长方形的周长相等，这个长方形的长是16分米，是宽的2倍，这个正方形的面积是多少？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">16 + 8</gadget>
<output>24</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">24 * (1/2)</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>