The volume

1) Tiles thick 5mm are stacked to 2m tall.
　So, the number of the tiles = 2m / 5mm = 2000/5 = 4000

2) If all the tiles are used to tile a floor,
　the area can be covered = 15cm x 6cm x 4000
　　　　　　　　　　　　= 0.15 x 0.06 x 4000 = 36 m²

ur question is not fully!!

i duno know the long ,wide of the floor,how can i help u to solve the problem!!