cylinder of wood with a length of 6 meters is cut into three equal sections on average, and the surface area is increased by 20 square decimeters, what is the volume of this cylinder of wood in cubic decimeters
一个长6米的圆柱体状的木头，把它平均截成相等的三段，表面积增加了20平方分米，则这个圆柱体木头的体积是多少立方分米
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">5 * 60</gadget>
<output>300</output>

<result>300</result>