The platform is 80 dm long and 60 dm wide, paved with rectangular slabs with dimensions of 0.3 m and 0.2 m.

The platform is 80 dm long and 60 dm wide, paved with rectangular slabs with dimensions of 0.3 m and 0.2 m. How many slabs were used to cover the site.

First of all, we will determine the area of a rectangular area with measurements of 80 dm and 60 dm using the formula:
S = a * b = 80 * 60 = 4800 dm².
The tile has a length of 0.3 m and a width of 0.2 m, we translate into dm:
0.3 m = 3 dm, 0.2 m = 2 m. Since 1 m = 10 dm.
S = 3 * 2 = 6 dm² – for one tile.
4800: 6 = 800 tiles were used to cover this site.