Answer:
[tex]\boxed{\text{24 570 bricks; Rs221 130}}[/tex]
Step-by-step explanation:
1. Number of bricks
(a) Volume of wall without windows
V = lwh = 30 m × 0.20 m × 5 m = 30 m³
(b) Volume of windows
One window: V = 1.5 m × 0.20 m × 3 m = 0.9 m³
Three window : V = 3 × 0.90 m³ = 2.7 m³
(c) Volume of wall with window openings
V = 30 m³ - 2.7 m³ =27.3 m³
(d) Volume of cement work
V = 0.10 × 27.3 m³ = 2.73 m³
(e) Volume of bricks
V = 27.3 m³ - 2.73 m³ =24.57 m³
(f) Volume of one brick
V = 0.20 m × 0.10 m × 0.05 m = 0.001 m³
(g) Number of bricks
[tex]\text{No. of bricks} = \text{24 570 m}^{3} \times \dfrac{\text{1 brick}}{\text{0.001 m}^{3} } = \textbf{24 570 bricks}\\\\\text{The wall will require } \boxed{\textbf{24 570 bricks}}[/tex]
2. Cost of bricks
[tex]\text{Cost}= \text{24 570 bricks} \times}\dfrac{\text{Rs9000}}{\text{ 1000 bricks}} = \text{Rs221 130 }\\\\\text{The cost of the bricks is } \boxed{\textbf{Rs221 130}}[/tex]