I hope you meant 20 inch by 20 inch tiles, but the answer is around 13.38
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Nine square feet is equal to 3.24 20-inch tiles.
20 inches = 1.666 feet 1.66x 1.666 = 2.777 sq feet 78/2.777 = 28 tiles
20" = 2.78 square feet. Now divide the area of the tiles into the area of the room. 140/2.78 = 51 tiles
There are 4 6X6 tiles per sq foot. So looks like 4 tiles X 5 Feet=20 tiles.