After a 2-meter-long cylinder is sawn into two small cylinders, the surface area increases by 20 square centimeters compared to the original one. What is the original volume in cubic centimeters?
长2米的圆柱形锯成2个小圆柱后，表面积比原来增加20平方厘米．原来的体积是多少立方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">10 * 200</gadget>
<output>2_000</output>

<result>2_000</result>