The radius of the bottom surface of a cylindrical container is 20 cm, and there is water in the cylinder. A conical iron block is submerged in the water, and the water rises (1/20). It is known that the diameter of the bottom surface of the cone is 20 cm, and the height is 30 cm. What is the original water depth in centimeters?
一个圆柱形容器的底面半径是20厘米，缸内盛有水，将一个圆锥型铁块侵没在水中，水上升(1/20)，已知圆锥底面直径20厘米，高30厘米．求原来水深多少厘米？
<result>50</result>