The sum of the sides of a cube is 2.4 decimeters, what is its surface area in square decimeters?
正方体棱长之和是2.4分米，它的表面积是多少平方分米．
<gadget id="calculator">2.4 / 12</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 * 0.2 * 6</gadget>
<output>0.24</output>

<result>0.24</result>