A cylindrical steel with a length of 11 decimeters is cut into three sections, and the sum of the surface areas increases by 6.4 square decimeters. What is the original volume of this steel in cubic decimeters?
一根长11分米的圆柱形钢材，截成三段后，表面积的和比原来增加6.4平方分米，这根钢材原来的体积是多少立方分米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">6.4 / 4</gadget>
<output>1.6</output>

<gadget id="calculator">1.6 * 11</gadget>
<output>17.6</output>

<result>17.6</result>