Putting two identical cylinders together to form a cylinder with a length of 30 cm, the surface area is reduced by 25.12 square centimeters. What is the volume of each cylinder in cubic centimeters?
把两个完全一样的圆柱，拼成一个长30厘米的圆柱，则表面积减少25.12平方厘米，原来每个圆柱的体积是多少立方厘米．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">12.56 * 15</gadget>
<output>188.4</output>

<result>188.4</result>