After two 2-meter-long cylinders with the same base area are joined together to form a steel cylinder, the surface area is reduced by 0.6 square decimeters. What is the volume of the assembled cylinder?
把两根底面积相等的2米长的圆柱体拼成一根圆柱体钢材以后，表面积减少了0.6平方分米，拼成后圆柱的体积是多少立方分米．
<gadget id="calculator">0.6 / 2</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 * 2 * 10 * 2</gadget>
<output>12</output>

<result>12</result>