Cut a 3m long cuboid wood into 2 sections on average, the surface area increases by 40dm**2, what is the volume of the original wood in cubic decimeters?
把一根长为3m的长方体木材平均截成2段，表面积增加了40dm**2，原木材的体积是多少立方分米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

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

<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<result>600</result>