There are two identical rectangles with a length of 5 decimeters and a width of 2 decimeters. Put them together to form a large rectangle, the perimeter of this large rectangle is at most how many decimeters.
有两个完全一样的长方形，长是5分米，宽是2分米．把它们拼成一个大长方形，这个大长方形的周长最多是多少分米．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 2 * 2</gadget>
<output>28</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<result>24</result>