Assumption 1: The question refers to 24 inch * 24 inch tiles (not 24 cm * 24 cm or some other measure).
Assumption 2: All off-cuts are used.
A 24" by 24" tile is 2' by 2' so that it covers 4 square feet.
294 sq feet / 4 sq ft = 73.5 so that the number of tiles required = 74
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Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
4.
24x24 inch tile equals 4 square feet 275/4 = 68.75 You would need 69. (24x24 inch tiles to cover 275 sqft)
250 tiles
157 18 by 18 tiles are needed to cover 352 square feet.