A 2-meter-long cuboid steel is cut into three sections, and the surface area is increased by 2.4 square decimeters compared to the original one. What is the original volume of this steel?
一个长2米的长方体钢材截成三段，表面积比原来增加2.4平方分米，这根钢材原来的体积是多少？
<gadget id="calculator">2.4 / 4</gadget>
<output>0.6</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">0.6 * 20</gadget>
<output>12</output>

<result>12</result>