A rectangular parallelepiped steel with a length of 2m is cut into two sections along the cross section, and the surface increases by 4dm**2. What is the volume of the rectangular parallelepiped steel in dm**3?
一根长2m的长方体钢材，沿横截面截成两段后，表面增加4dm**2，这段长方体钢材的体积是多少dm**3．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">2 * 20</gadget>
<output>40</output>

<result>40</result>