Question

Pls solve it ........​

Answer 1

Rs. 405

Explanation:

To find the area of the four walls of the room, we need to subtract the area of the door and the three windows from the total area of the four walls.

Area of the four walls = 2 × height ( length + breadth)

= 2 × 6.5 (1 + 8)

= 2 × 6.5 × 9

= 117 square meters

`\hrulefill`

Area of the door: length × width

= 3 × 1.5

= 4.5 square meters

`\hrulefill`

Area of each window = length × width

= 1.5 × 1

= 1.5 square meters

`\hrulefill`

Total area of the three windows:

= 1.5 × 3

= 4.5 square meters

`\hrulefill`

Total area to be whitewashed: Area of 4 wall - Area of door - Area of 3 windows

= 117 square meters - 4.5 square meters - 4.5 square meters

= 108 square meters

`\hrulefill`

Cost of whitewashing: Area × rate

= 108 square meters × Rs. 3.75 per square meter

= Rs. 405

Therefore, the cost of whitewashing the walls of the room is Rs. 405.