consider modular Brick, size of brick = 19 cm × 9 cm × 9 cm Now, volume of brick with mortar = 20 cm × 10 cm × 10 cm = 0.002 m‌3 Volume of Brick work in 1 m‌3 No. of Brick =
Volume‌of‌Brick‌work
Volume‌of‌1‌brick‌withmortar
=
1
0.002
= 500 bricks No. of bricks for 20m‌3 brick work = 20 × 500 = 10,000 Bricks