The length of a cuboid is 12 decimeters, and it is divided into three parts along the length. The sum of the surface areas of the three small cuboids is 12 decimeters larger than the surface area of the original cuboid. What is the volume of the original cuboid?
一个长方体的长是12分米，沿着长平均分成三段，得到的三个小长方体的表面积总和比原长方体的表面积增加了12平方分米，原长方体的体积是多少立方分米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<result>36</result>