If a cylindrical piece of wood with a length of 2 meters is sawed 4 times, the surface area increases by 4 square decimeters, what is the volume of this wood in cubic decimeters?
把一根长2米的圆柱形木料锯4次，表面积增加了4平方分米，这根木料的体积是多少立方分米．
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">(1/2) * 20</gadget>
<output>10</output>

<result>10</result>