If a cuboid is divided into two cuboids parallel to the bottom surface, the sum of the surface areas increases by 8 square decimeters, and the height of the cuboid is 4 decimeters, what is the volume of the original cuboid?
一个长方体如果沿平行于底面分成两个长方体之后，表面积之和比原来增加了8平方分米，这个长方体高4分米，那么原长方体的体积是多少．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>