cuboid piece of wood is 2.5 meters long, cut into two sections along the cross section, and the surface area increases by 80 square decimeters, what is the volume of this piece of wood in cubic meters?
一根长方体木料长2.5米，沿横截面截成两段，表面积增加80平方分米，这根木料的体积是多少立方米．
<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 * 2.5</gadget>
<output>1</output>

<result>1</result>