cuboid wood with a length of 3.5 decimeters is sawed into 6 sections on average, and the surface area is increased by 125 square centimeters compared with the original one. Find the original volume of the piece of wood.
把一根长3.5分米的长方体木料平均锯成6段，表面积比原来增加125平方厘米，求这段木料原来的体积．
<gadget id="calculator">125 / 10</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">3.5 * 10</gadget>
<output>35</output>

<gadget id="calculator">(25/2) * 35</gadget>
<output>875/2 = around 437.5</output>

<result>875/2 = around 437.5</result>