Three cubes with a surface area of 12 square decimeters are put together to form a cuboid. What is the surface area of this cuboid?
三个表面积都是12平方分米的正方体拼成一个长方体，这个长方体的表面积是多少平方分米．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">36 - 8</gadget>
<output>28</output>

<result>28</result>