Assuming you lay them all the same way....
4x8 = 32, area of a brick.
6x24 = 144, area of the walkway.
Now, the walkway is in square feet, so we need to multiply by 144 to change it to square inches.
144 x 144 = 20,736.
Divide this by the area of the brick.
20,736 / 32 = 648
So you need 648 bricks to cover the entire walkway.
648
648
18 across and 36 long
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
Approximately 648 bricks will be required. You have to revise that up a little bit for wastage.
648 bricks to build the walk
648
648
There is no information on the heights of either the bricks or the wall!
648
648
You don't say how high the wall is.
18 across and 36 long
648
A single layer will require 144 bricks.
Amount of bricks needed: 12(6*24)/(4*8) = 54
18 x 72 = 1296