The length of a rectangle is 8 cm and the width is half the length. What is the perimeter of the rectangle?
一个长方形长8厘米，宽是长的一半，这个长方形的周长是多少
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

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

<result>24</result>