Question

how many bricks each 25cm,12.5cm,7.5cm will be required to build a wall 5m long 3m high and 30cm thick.

Answer 1

42187.5(42188 approx)

according to my calculations

Answer 2

Here Dimensions of Cuboidal wall (in cm) = 500 cm × 300 cm × 30 cm

Dimension of one brick (in cm) = 25 cm × 12.5 cm × 7.5 cm

If you observe, Dimension of the wall is a space which we're filling with bricks

∴ Number of Bricks = Volume of Cuboidal Wall ÷ Volume of one Brick

= $\frac{500 \times 300 \times 30}{25 \times 12.5 \times 7.5}$

= 1920

Hence, 1920 Bricks are required to construct the wall.