After cutting a 60 cm long cylinder into two small cylinders, one long and one short, the total surface area increases by 20 square centimeters. What is the original volume of the cylinder in cubic centimeters?
把长60厘米的圆柱体截成了一长一短两个小圆柱体后，表面积总和增加了20平方厘米．这个圆柱原来的体积是多少立方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 60</gadget>
<output>600</output>

<result>600</result>