There is 121 square feet in a 11'x11' room.
A 30ft x 14ft room = 420 square feet.
99 square feet !
228 square feet
361 square feet.
20
13X13=169
184 would do it but get 185.
169 square feet
400 square feet.
If you are willing to use offcuts to fill in spaces, mosaic-style, then 50 tiles will suffice. But you could require up to twice as many if you want a neat finish.
525 square feet.
252 square feet.
240 square feet
300 square feet.
162 square feet.
120 square feet.