A 5 decimeter long cuboid piece of wood is sawed into 3 sections, and the surface area is increased by 64 square centimeters compared to the original one. What is the original volume of this piece of wood in cubic centimeters?
把一个长5分米的长方体木料锯成3段，表面积比原来增加了64平方厘米，这根木料原来的体积是多少立方厘米？
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

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

<gadget id="calculator">16 * 50</gadget>
<output>800</output>

<result>800</result>