Question

How many brick each 25cm long 10cm wide and 7.5cm thick, will be required for wall 15m long 2.5cm hight and 1.25m thick.

Answer 1

$\spades \tt \: Length \: of \: brick \: = 25cm$

$\spades \tt \: Breadth \: of \: brick = 10cm$

$\spades \tt \:Thickness \: of \: brick \: = 7.5cm$

$\\ \clubs \tt \:L ength \: of \: wall = 15m = 1500cm$

$\clubs \tt \: Breadth \: of \: wall = 2.5cm$

$\clubs \tt \: Height \: of \: wall = 1.25m = 125cm$

$\hearts \tt \: Number \: of \: bricks = \dfrac{volume \: of \: wall}{volume \: of \: brick} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \tt = \dfrac{1500 \times 2.5 \times 125}{25 \times 10 \times 7.5}$

${ \red{\boxed {\mathfrak { \dag required \: bricks = 250 \dag}}}}$