15 tiles exactly.
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A 4 inch by 4 inch tile is 16 square inches. 60 square feet is 8640 square inches. Dividing the one by the other shows us that 540 tiles 4 inches on a side will cover an area of 60 square feet.
Assuming the tiles are 11.75 inches * 11.75 inches, the area of each tile is 138.0625 sq inches. Area to be covered = 60 sq feet = 60*144 = 8640 sq inches. So, minimum number of tiles required = 62.58 = 63 tiles. That is the mathematical answer. However, it assumes that almost all the offcuts are used, that there is virtually no wastage. In real life that will not be the case, particularly if the 60 square feet shape is ill formed - a random shape with lots of narrow bits sticking out, for example.
sqrt(8640) = 92.95 (to 2 dp)
8640 in
Well, honey, if the area of the restaurant is 60 square inches and you're using a scale of 1 inch to 12 feet, then the actual area of the restaurant would be 720 square feet. Just take that tiny 60 square inches and blow it up to a whopping 720 square feet with that 1 inch to 12 feet scale. It's like magic, but with math.