If a 2-meter-long cylindrical stick is sawn into three pieces, the surface area increases by 40dm**2, what is the original volume of the stick in dm**3.
把2米长的圆柱形木棒锯成三段，表面积增加了40dm**2，原来木棒的体积是多少dm**3．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 10</gadget>
<output>200</output>

<result>200</result>