If two cubes with side lengths of 3 decimeters are put together to form a cuboid, what is the surface area of the cuboid?
把2个棱长是3分米的正方体拼成一个长方体，长方体的表面积是多少．
<gadget id="calculator">3 * 3 * 6 * 2</gadget>
<output>108</output>

<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<gadget id="calculator">108 - 18</gadget>
<output>90</output>

<result>90</result>