The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors a

1.	The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows in the room; each door measures 2.5 m by 1.2 m and each window 1.5 m by 1 m. Find the cost of painting the walls at Rs. 3.50 per square metre.
Answer» Given, Dimension of room = 12.5m × 9m × 7m Dimension of door = 2.5m × 1.2m Dimension of window = 1.5m × 1m So, area of room = 2(l + b)h = 2(12.5 + 9)×7 = 301 m² Area of 2 doors = 2(2.5 × 1.2) = 6m² Area of 4 windows = 4(1.5 × 1) = 6 m² So, area to be painted = (301 - 12) = 289 m² ∴ cost of painting walls at rate Rs.3.50 per m² = 3.50 × 289 = Rs.1011.50

The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows in the room; each door measures 2.5 m by 1.2 m and each window 1.5 m by 1 m. Find the cost of painting the walls at Rs. 3.50 per square metre.

Answer»

Given,

Dimension of room = 12.5m × 9m × 7m

Dimension of door = 2.5m × 1.2m

Dimension of window = 1.5m × 1m

So, area of room = 2(l + b)h = 2(12.5 + 9)×7 = 301 m²

Area of 2 doors = 2(2.5 × 1.2) = 6m²

Area of 4 windows = 4(1.5 × 1) = 6 m²

So, area to be painted = (301 - 12) = 289 m²

∴ cost of painting walls at rate Rs.3.50 per m² = 3.50 × 289 = Rs.1011.50