A 4-meter-long cylinder of wood is sawed into 2 sections (both sections are cylinders), and the surface area increases by 60 square decimeters. What is the volume of this piece of wood in cubic decimeters?
将一根长4米的圆柱体木料锯成2段(2段都是圆柱体)，表面积增加60平方分米．这根木料的体积是多少立方分米．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 * 4 * 10</gadget>
<output>1_200</output>

<result>1_200</result>