180
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180 sq ft if 12 X 15 is actually 12 ft X 15 ft. Otherwise anything you like.
6x - 12 = 3x + 15 3x = 27 x = 9
If: 2x-3y = -15 and x = 4y Then: x = -12 and y = -3
Area to be covered: 15 x 16 = 240 square units Area of tile = 12 x 12 = 144 square units Number of tiles required = 240/144 = 1.66... . So 2 tiles will be sufficient.
-9