There is a cuboid wood with a length of 5m. After being cut into 3 sections on average, the surface area increases by 120dm**2. Find the volume of the log in dm**3.
有一根长5m的长方体木料，平均截成3段后，表面积增加了120dm**2，求原木料的体积是多少dm**3．
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">30 * 50</gadget>
<output>1_500</output>

<result>1_500</result>