After dividing a 5-meter-long cuboid into 5 sections, the surface area increases by 128 square decimeters compared to the original. What is the volume of this log in cubic decimeters?
把一根5米长的长方体木料据成5段后，表面积比原来增加128平方分米．这根木料的体积是多少立方分米？
<gadget id="calculator">128 / 8</gadget>
<output>16</output>

<gadget id="calculator">16 * 5 * 10</gadget>
<output>800</output>

<result>800</result>