Depends on the side length of the tiles.
20.
12X20 = 240 sq feet 12"x12" tiles are 1 sq foot each so must be 240/1= 240
A square with 6" on each side is 1/4 sq ft, so there are 4 tiles in 1 sq ft, and 4 tiles x 8 = 32 tiles.
You will need 140 tiles (10 x 14 = 140)
12 " x 12 " = 1 foot by 1 foot = 1 sq foot. 900 / 1 = 900 tiles are needed (plus waste).
20.
36 tiles. First you have to convert 20 inches to feet. There are 12 inches in a foot so 20/12 means you have one and two-thirds length tiles. Then, you have to figure out the lenght of the sides of the room which is the square root of 100 sq ft. which is 10 feet long. Now, you have to figure out how many tiles it will take to do one length of the room by 10/one and two-thirds which is 6 tiles. Finally you have to multiply the length times the width to get how many tiles it takes to fill the room by 6*6=36 tiles
12X20 = 240 sq feet 12"x12" tiles are 1 sq foot each so must be 240/1= 240
A square with 6" on each side is 1/4 sq ft, so there are 4 tiles in 1 sq ft, and 4 tiles x 8 = 32 tiles.
There would be 4 of the 1/2" tiles in each sq inch since 12"x12" = one sq ft There are 144 sq inches in a sq foot
one
You will need 140 tiles (10 x 14 = 140)
one 12 x 12 tile is one sq ft you need 480/1 = 480 tiles
12 " x 12 " = 1 foot by 1 foot = 1 sq foot. 900 / 1 = 900 tiles are needed (plus waste).
A 12*12 sq inch tile has an area of 1 square foot. So, to cover 20 sq ft you will require a minimum of 20 tiles. I say "minimum" because the actual number depends on the shape of the area to be covered and whether or not all offcuts can be used.
12 X 12 = 144 inches = 1 Square Foot of tile 165 X 144 = 23760 20 X 20 = 400 23760 / 400 = 60 tiles
Assuming the tiles are 6" x 20", the area of 1 tile = 1/2 x (1 and 2/3) = 1/2 x 5/3 square feet which is 5/6 square feet. To cover 1800 sq ft, the number of tiles required is 1800 / (5/6) = 1800 x 6/5 = 360 x 6 = 2160