One tile of 6 ft x 24 ft will cover 144 sq feet and so should be sufficient.
If you did not mean 6 feet x 24 feet you should have specified the measurement units that you had in mind.
Four tiles are needed.
How many 24x24 tiles it take to cover a 14×14 room
128.2 tiles
226 tiles
54 tiles are needed
It depends on how big the tiles are.
Four tiles are needed.
240 square tiles are needed
6' x 9' (54 square feet) = 6 square yards of tiles needed.
How many 24x24 tiles it take to cover a 14×14 room
128.2 tiles
226 tiles
54 tiles are needed
120
22.2 tiles so buy 23 tiles.
It would be 9 tiles wide by 12 tiles long. That gives you a total of 108 tiles.
14.4 .About 15