After cutting a 5-meter-long piece of wood into two sections along the cross-section, the surface area increases by 10 square decimeters. What is the original volume of this piece of wood in cubic meters?
把一根长5米的木料沿横截面截成2段后，表面积增加10平方分米，原来这根木料的体积是多少立方米．
<gadget id="calculator">10 / 2 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>