After a 2.5-meter-long cylinder of wood is cut into 4 sections, the surface area increases by 480cm**2, so what is the original volume of the cylinder of wood in dm**3.
将一个长2.5米的圆柱体木料横截成4段后，表面积增加480cm**2，那么这个圆柱体木料原来的体积是多少dm**3．
<gadget id="calculator">480 / 6 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 2.5 * 10</gadget>
<output>20</output>

<result>20</result>