How many granite 18x18 tiles will cover 214 square feet?

Answer 1

Assuming 18x18 refers to 18 inches by 18 inches,

each tile has an area of 1.5*1.5 = 2.25 sq ft.

214 sq feet at 2.25 sq feet per tile = 214/2.25 = 95.11... so 96 tiles.

That also assumes that the area to be covered is well behaved and that nearly all the offcuts are reused.