A cylinder 36 cm long is cut into two cylinders, one long and one short, according to the ratio of 5:4, and the surface area increases by 50 square centimeters. What is the volume of the original cylinder in cubic centimeters?
36厘米长的圆柱按5：4截成两个一长一短的圆柱，表面积增加了50平方厘米．原来圆柱的体积是多少立方厘米．
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 36</gadget>
<output>900</output>

<result>900</result>