A 4-meter-long log is cut into 3 small logs, and the surface area is increased by 24 square decimeters. What is the original volume of this log in cubic decimeters?
把一根4米长的圆木截成3段小圆木，表面积增加了24平方分米，这根圆木原来的体积是多少立方分米
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">6 * 40</gadget>
<output>240</output>

<result>240</result>