Question

A brick measures $20cm\times 10cm\times 5cm.$ How many bricks would be required to build a wall of $10m\times 15m\times 0.2m.$ ?

Answer 1

Dimension of brick are $=20cm\times 10cm\times 5cm$

volume of 1 brick $=20\times 10\times 5=1000c{m}^3$

Dimension of wall $=10m\times 15m\times 0.2m$

volume of wall $=10\times 15\times 0.2=30m^3$

now no. of brick requried to make wall $=\frac{volumeofwall}{volumeof1brick}$

no. of bricks $=\frac{30m^3}{1000m^3}=\frac{30}{1000}\times {10}^6=30\times {10}^3$

[no. of bricks =30,000 bricks.]