piece of cuboid wood with a height of 16 decimeters is cross-cut into two pieces of wood along the horizontal direction, and the surface area increases by 40 square decimeters. What is the volume of this cuboid wood in cubic decimeters?
一块长方体木料，高16分米，沿着水平方向横切成两根木料，表面积增加了40平方分米，原来这块长方体木料的体积是多少立方分米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>