A pond 3 meters long, 2.5 meters wide and 1.8 meters deep has been constructed for soaking bricks. When the water in the pond was 8 decimeters deep, some bricks were soaked in it. Even after the bricks had absorbed `1/5` part of the water, it was found that the water level had risen by 5.2 decimeters. If the length, width and height of each brick are 25 cm, 12.5 cm and 8 cm respectively, how many bricks were soaked?