Cut a 15 decimeter cylindrical piece of wood into two pieces, the surface area increases by 20 square decimeters, what is the volume of this cylinder in cubic decimeters
把一根15分米的圆柱形木料，截成两段，表面积增加20平方分米，这根圆柱的体积是多少立方分米
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<result>150</result>