A cylindrical wooden column with a length of 8 meters is cut into two cylindrical wooden columns, and the surface area is increased by 30 square decimeters. What is the volume of the original cylindrical wooden column in cubic meters?
一根圆柱形木柱长8米，把它截成两段圆柱形木柱，表面积增加了30平方分米，原来圆柱形木柱的体积是多少立方米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>