A single layer will require 144 bricks.
There is no information on the heights of either the bricks or the wall!
You don't say how high the wall is.
648
Amount of bricks needed: 12(6*24)/(4*8) = 54
648
648 bricks to build the walk
648
There is no information on the heights of either the bricks or the wall!
648
You don't say how high the wall is.
18 across and 36 long
648
18 x 72 = 1296
648
Assuming you actually require 24 feet long and 6 high as a 6 wide wall will be only 4 inches high. The bricks required without cutting contingency is 803
Amount of bricks needed: 12(6*24)/(4*8) = 54
(6 x 12 x 24 x 12)/(32) = 648 bricks