There is 144 sq inches in a square foot... how many sq inches in your brick?
16 x 16 = 256 Sq Ins /144 = 1.78 sq ft per brick 121 / 1.78 = 68 Bricks but I would buy 3 or 4 extra depending on cuts you need to make.
9 tons
1076.391042 sq. ft.
5220.5 sq ft
19681.81 sq ft
32 sq. ft.
1 sq yd are in 9 sq ft
The question does not specify the units used for the size of each brick. Assuming the brick's dimensions are given in inches, each brick covers 4" x 8" = 1/3 ft x 2/3 ft = 2/9 sq ft. Area to be covered = 320 sq ft so minimum number of bricks required = 320 / (2/9) = 1440 bricks. That answer assumes that the area to be covered is well behaved and that all offcuts are used.
3 sq yards = 3*9 sq ft = 27 sq ft
288 sq ft
1120 sq ft