Three identical cubes of wood are put together to form a cuboid, so that the surface area is reduced by 100 square decimeters. What is the volume of a cube in cubic decimeters?
3个完全一样的正方体木块，拼成一个长方体，这样表面积减少100平方分米，一个正方体的体积是多少立方分米．
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<result>125</result>