Question

How many bricks, each measuring $25cm\times 11.25cm\times 6cm$, will be needed to build a wall of $8m\times 6m\times 22.5cm$?

• A. 5600
• B. 6000
• C. 6400
• D. 7200

Answer 1

The correct option is C 6400

Given,
$\text{dimension of each brick}=25cm\times 11.25cm\times 6cm$
$\text{dimension of the wall}=8m\times 6m\times 22.5cm=800cm\times 600cm\times 22.5cm\left(\text{Unit conversion from m to cm}\right)$

Both, bricks and wall are in the shape of cuboid and volume of a cuboid of dimensions l x b x h = lbh.

Volume of the wall = Number of bricks x Volume of one brick

$\text{No. of bricks}=\frac{\text{Vol. of wall}}{\text{Vol. of one brick}}=\frac{800\times 600\times 22.5}{25\times 11.25\times 6}=6400$