That room would be 169 s.f.
There is 121 square feet in a 11'x11' room.
A 30ft x 14ft room = 420 square feet.
99 square feet !
228 square feet
20.07 square meters
20
13X13=169
184 would do it but get 185.
169 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.
400 square feet.
16' x 15' = 240 square feet.
A simple rectangular room 20 feet by 18 feet has 360 square feet.
240 square feet
252 square feet.
120 square feet.
300 square feet.