Mathematics

Problem

How many bricks, (each measuring

20 \text{ cm} \times 16 \text{ cm} \times 8 \text{ cm}

), will be required to build a wall

30 \text{ m}

long,

30 \text{ cm}

thick and

5 \text{ m}

high, with a provision of

2

doors, each measuring

2.5 \text{ m} \times 1.2 \text{ m}

. It is given that one-ninth of the wall is occupied by the cement and the sand mixture.