A square log is 10 decimeters long. After sawing it into two pieces, the surface area increases by 25 square decimeters. What is the volume of this square log in cubic decimeters?
一根方木长10分米，把它锯成两段后，表面积增加了25平方分米，这根方木的体积是多少立方分米．
<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) * 10</gadget>
<output>125</output>

<result>125</result>