There is a piece of wood with a length of 2 meters. Its cross-section is square. Cut it into two sections whose cross-section is still square. The surface area is increased by 50 square decimeters. Find the volume of this wood.
有一根长2米的木料，它的横截面是正方形，把它平均截成横截面还是正方形的两段，表面积比原来增加了50平方分米，求这根木料的体积．
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

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

<gadget id="calculator">25 * 20</gadget>
<output>500</output>

<result>500</result>