The height of a cylinder is reduced by 4 decimeters. Now the height of the cylinder is just equal to the original (2/3), and the surface area is reduced by 12.56 square decimeters. What is the volume of the original cylinder?
一个圆柱高减少4分米，现在圆柱的高正好相当于原来的(2/3)，表面积比原来减少12.56平方分米，原来圆柱的体积是多少？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / (1/3)</gadget>
<output>12</output>

<gadget id="calculator">3.14 * 4 * 12</gadget>
<output>150.72</output>

<result>150.72</result>