If a 3 decimeter long cuboid is sawed into 3 sections on average, the surface area is increased by 40 square centimeters, what is the original volume of this piece of wood?
把一根长3分米的长方体木料平均锯成3段，表面积比原来增加了40平方厘米，这根木料原来的体积是多少．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">10 * 30</gadget>
<output>300</output>

<result>300</result>