If two identical cubes are put together to form a cuboid, the surface area is reduced by 18 square decimeters. What is the volume of the cube?
把两个同样的正方体拼成一个长方体，表面积减少了18平方分米，这个正方体的体积是多少．
<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<result>27</result>