If a log with a length of 2m is cut into 3 sections, the surface area is increased by 80 square decimeters, what is the volume of the log in cubic meters?
把一根长2m的圆木截成3段，表面积增加了80平方分米，这根圆木的体积是多少立方米．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

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

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<result>400</result>