A piece of cuboid wood with a length of 2m, after cutting it into 5 sections, the surface area increases by 40dm**2, what is the volume of this piece of wood in cubic decimeters?
一段长2m的长方体木料，将它截成5段后，表面积增加了40dm**2，这根木料的体积是多少立方分米？
<gadget id="calculator">40 / 8</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<result>100</result>