A 5-meter-long cylindrical wood is sawed into 6 sections, and the surface area is increased by 800 square centimeters compared to the original one. What is the original volume of this wood in cubic decimeters?
把一根5米长的圆柱形木料锯成6段，表面积比原来增加了800平方厘米，这根木料的体积原来是多少立方分米．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">800 / 10</gadget>
<output>80</output>

<gadget id="calculator">100 / 1_000</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 * 5 * (1/10)</gadget>
<output>40</output>

<result>40</result>