After sawing a 8-meter-long cuboid into two pieces, the total surface area of the two pieces increases by 4 square decimeters. What is the volume of the original cuboid wood?
有一根8米长的长方体木料锯成两段后，这两段木料表面积总和比原来增加4平方分米．求原来这根长方体木料的体积是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">2 * 80</gadget>
<output>160</output>

<result>160</result>