Question

A wall 15m long 30 cm wide in 4m high is made of bricks each measuring 22 CM X 12.5 CM X 7.5 CM . If 1/12 of the total volume of the wall consist of mortar, how many brick are there in a wall

Answer 1

hey dear here is ur answer

Height of the wall = 4m = 400cm 

Length of the wall = 15m = 1500cm 

Width of the wall = 30cm 

∴ Volume of the wall = (400 * 1500 * 30)cm3 = 18000000 cm3 

Given 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 = 20 cm,  b = 12.5 cm, h = 7.5 cm. 

Volume of each brick = (20 x 12.5 x 7.5) cm3 = 1875 cm3 

Now the number of bricks in wall = Volume of the wall consisting of bricks / Volume of one brick. 

Number of bricks in wall = 16500000/1875 = 8800. 

Thus, there are 8800 bricks in the wall. 

Hence, the required number of bricks is 8800.

hope it helps u