If you multiply 30 x 16 you should get a good approximation...
The room is 144 square feet.
0
144 ft2
144
A 19' x 15' room is 285 square feet or 26.477 square meters.
144 !
240 square tiles are needed
About five (4.975) such boxes.
144 square feet. (12 x 12 = 144) or 16 square yards.
640
108 square feet
165 square feet