A cuboid can be cut into two cubes. After cutting, the surface area increases by 18 square decimeters. What is the volume of this cuboid?
一个长方体正好可以截成两个正方体，截开后表面积增加了18平方分米，这个长方体的体积是多少立方分米．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">3 * 3 * 6</gadget>
<output>54</output>

<result>54</result>