Given: For the cuboidal shape brick:
length (l ) = 25 cm,
breadth (b ) = 15 cm,
height (h ) = 10 cm
For the cuboidal shape wall:
length (l ) = 6 m,
height (h ) = 2.5 m, breadth (b ) = 0.5 m
To find: Number of bricks required
When all the bricks are arranged to build a wall, the volume of all the bricks is equal to volume of wall.
∴ Number of bricks
= volume of the wall/volume of a brick
i. Volume of a brick = l1 x b1 x h1
= 25 x 15 x 10 cc
ii. l2 = 6m = 6 x 100 …[∵ 1m = 100cm] = 600 cm
h2 = 2.5 m = 2.5 x 100 = 250 cm
b2 = 0.5 m = 0.5 x 100 = 50 cm
Volume of the wall = l2 x b2 x h2
= 600 x 50 x 250 cc
iii. Number of bricks = volume of the wall/volume of a brick
= 600 × 50 × 250/25 × 15 × 10
= 40 x 2 x 25
= 2000 bricks
∴ 2000 bricks are required to build the wall.