A cylindrical piece of wood with a length of 1.5 meters is sawn into 3 sections, and the surface area increases by 20 square decimeters. What is the original volume of this cylindrical piece of wood?
一根长1.5米的圆柱形木料，锯成3段以后，表面积增加了20平方分米，这根圆柱形木料原来的体积是多少立方分米．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">1.5 * 10</gadget>
<output>15</output>

<gadget id="calculator">5 * 15</gadget>
<output>75</output>

<result>75</result>