After a 2.5-meter-long cylindrical wood is cut into three small cylinders, the surface area increases by 9.6 square decimeters. What is the original volume of this cylindrical wood?
把一根长2.5米的圆柱形木头截成三段小圆柱后，表面积比原来增加9.6平方分米，这根圆柱形木头原来的体积是多少立方分米？
<gadget id="calculator">9.6 / 4</gadget>
<output>2.4</output>

<gadget id="calculator">2.5 * 10</gadget>
<output>25</output>

<gadget id="calculator">2.4 * 25</gadget>
<output>60</output>

<result>60</result>