Given the dimension of the squared tile = 10 cm
The dimension of the rectangular wall = 15 m by 7 m
we will find the area of the wall and the tile, then divide the area of the wall by the area of the tile.
Note: take care of the units
So, the area of the rectangular wall = 15 x 7 = 105 m^2
Convert to square cm
So, 1 m = 100 cm
So, 1 m^2 = 10,000 cm^2
So, the area of the rectangular wall = 1,050,000 cm^2
The area of the squared tile = 10 x 10 = 100 cm^2
So, the number of tiles = 1,050,000/100 = 10,500 tiles
So, the answer is option 10,500