A log is 2 meters long. If it is cut into 3 small logs, the surface area increases by 40 square decimeters. What is the volume of this log in cubic decimeters?
一个圆木长2米，如果把它截成3段小圆木，表面积增加了40平方分米，这根木料的体积是多少立方分米．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 10</gadget>
<output>200</output>

<result>200</result>