If a 2-meter cuboid is sawn into two 1-meter-long pieces, the surface area increases by 2 square decimeters. Find the original volume of the wood.
把一根2米的长方体木料锯成1米长的两段，表面积增加了2平方分米，求这跟木料原来的体积．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<result>20</result>