Question

A brick measures 20 cm by 10 cm 7 1/2 cm. How many bricks will be required for a wall 25m long, 2m high 5/4m thick​

Answer 1

Volume of wall = Volume of brick × no. of bricks

let no. of bricks be N

(2500 × 200 × 125)cm³ = (20 × 10 × 7.5)cm³ × N

N = (2500 × 200 × 125)cm³ / (20 × 10 × 7.5)cm³

= 41666.66

So the number of bricks is 41667.