To determine the volume of brick in 1 CFT, multiply Length, Width and Height.

Now, take volume as V.

So, V = L x W x T = 0.75 x 0.41 x 0.25 = 0.076 ft3

Therefore, total numbers of brick in 1 CFT = 1/0.076 = 13.15 bricks

Suppose, the mortar comprises of 10% area.

So, 13.15 x 10/100 = 1.315

So, the total numbers of bricks without mortar = 11.835

Suppose, 5% wastage is occurred in bricks.

So, 11.835 x 5/100 = 0.591

Therefore, total numbers of bricks in 1 CFT = 11.835 + 0.591 = 12.426 or 12.5 (approx)

So, in 1 CFT, the numbers of bricks required = 12.5