If a cylindrical piece of wood with a length of 5 meters is sawn into 4 pieces, the surface area is increased by 60 square decimeters, what is the volume of this piece of wood?
把一根长5米的圆柱形木料锯成4段，表面积增加60平方分米，这根木料的体积是多少．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">0.6 / 6</gadget>
<output>0.1</output>

<gadget id="calculator">0.1 * 5</gadget>
<output>0.5</output>

<result>0.5</result>