If a piece of wood 1 meter long is cut into 3 sections on average, the surface area increases by 12 square decimeters. What is the original volume of this wood in cubic decimeters?
把一根1米长的木料，平均截成3段，表面积增加了12平方分米，原来这根木料的体积是多少立方分米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 1 * 10</gadget>
<output>30</output>

<result>30</result>