A house, with an area of 18 square meters of brick floor, need 192. If the side length of 4 decimeters of brick, need how many?

A house, with an area of 18 square meters of brick floor, need 192. If the side length of 4 decimeters of brick, need how many?

192*18=3456
0.4*0.4=0.16
3456/0.16=21600