A large cube is composed of several small cubes with a side length of 1 cm. If the surface of the big cube is painted, there are 24 small cubes painted on one side, and how many small cubes are painted on both sides.
一个大正方体由若干个棱长1厘米的小正方体组成，在大正方体的表面涂色，其中一面涂色的有小正方体有24个，则两面涂色的有小正方体有多少个．
<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<result>24</result>