If a cylindrical piece of wood with a length of 30 cm is cut into two pieces of the same length, the surface area is increased by 40 square centimeters, what is the original volume of the wood?
把一根长30厘米的圆柱形木料，截成同样长的两段，表面积增加了40平方厘米，这根木料原来的体积是多少．
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<result>600</result>