If a 1-meter-long cylindrical steel is cut into three sections parallel to the cross-section, the surface area is increased by 20 square decimeters compared to the original one. What is the original volume of this steel?
把一根长1米的圆柱形钢材平行于横截面截成3段，表面积比原来增加20平方分米，原来这根钢材的体积是多少？
<gadget id="calculator">0.02 / 4</gadget>
<output>0.005</output>

<gadget id="calculator">0.005 * 1</gadget>
<output>0.005</output>

<result>0.005</result>