If three squares with a side length of 2 decimeters are used to form a rectangle, what is the perimeter of the rectangle?
用三个边长为2分米的正方形，拼成一个长方形，那么长方形的周长是多少分米
<gadget id="calculator">2 + 2 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>