Question

please answer this fastly
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Answer 1

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.

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