Question

Find the no. of bricks measuring 50cm*30cm*20 cm required to construct a wall 30 m long 4 m high and 100 cm broad

Answer 1

sol: Height of the wall = 4m = 400cmLength of the wall = 15m = 1500cm Width of the wall = 30cm ∴ Volume of the wall = (400 * 1500 * 30)cm3 = 18000000 cm3Given that 1/12 volume of wall consist of mortar . Volume of the wall consisting of mortar = 18000000 cm3 / 12 = 1500000 cm3 Sothat Volume of wall consisting of bricks = 18000000 - 1500000 = 16500000cm3. Dimensions of brick l = 22 cm,  b = 12.5 cm, h = 7.5 cm. Volume of each brick = (22 x 12.5 x 7.5) cm3 = 2062.5 cm3 Now the number of bricks in wall = Volume of the wall consisting of bricks / Volume of one brick. Number of bricks in wall = 16500000/2062.5 = 8000.Thus, there are 8000 bricks in the wall.Hence, the required number of bricks is 8000.