A cuboid with a surface area of 42cm**2 is exactly cut into 3 cubes of the same size, what is the surface area of each cube in square centimeters?
一个表面积为42cm**2的长方体，正好底截成3个同样大小的正方体，每个正方体的表面积是多少平方厘米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>