A rectangular parallelepiped glass cylinder is 4 decimeters long, 3 decimeters wide and 10 decimeters high. Now half of the water is filled in it. If a potato is completely immersed in the water, the water level rises by 0.05 decimeters. The volume of the potato is How many cubic decimeters?
一个长方体玻璃缸，长4分米，宽3分米，高10分米，现在在它里面装有一半的水，把一个土豆完全浸入到水中，水面上升了0.05分米，这块土豆的体积是多少立方分米？
<result>12</result>