A long table is equipped with 4 small stools, two tables can be combined with 6 small stools, three tables can be combined with 8 small stools, and so on, how many small stools can be equipped with 11 tables.
一长桌子配4把小凳子，两张桌子拼起来可以配6个小凳子，三张桌子拼起来可以配8个小凳子，照此类推，11张桌子拼起来可以配多少把小凳子．
<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<gadget id="calculator">22 + 2</gadget>
<output>24</output>

<result>24</result>