Question: how to find qty of bricks?
Answer: Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick. Mortar Thickness is = 10 mm.
Mortar quantity is 0.2305 (Wet Condition) we calculate Dry Value. Dry Mortar Value is = 0.2305 x 1.33 = 0.306565 m3.
Volume = 0.306565x (1/7) = 0.0438. ... 
Volume = 0.306565x (6/7) = 0.2627.