If a 4-meter-long cuboid is cut into two pieces, the surface area is increased by 1.6 square meters compared with the original one. What is the volume of this piece of wood in cubic meters?
把一根长4米的长方体木料切成两段，表面积比原来增加了1.6平方米，这根木料的体积多少立方米．
<gadget id="calculator">1.6 / 2</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 4</gadget>
<output>3.2</output>

<result>3.2</result>