The length, breadth and height of a room are 15.35 m, 4.65 m and 6.50

1.	The length, breadth and height of a room are 15.35 m, 4.65 m and 6.50 m respectively. If there are 4 doors each of size 1.5 m x 1.3 m and 3 windows each of size 1.5 m x 1.2 m, then find the cost to paint the four walls of room at the rate of Rs 3.40 per sq. m.
Answer» Here l = 15.35 m, b = 4.65 m and h = 6.50 m ∴ Area of four walls = 2 x (l + b) x h = 2 x (15.35 + 4.65) x 6.50 = 2 x 20 x 6.50 = 260 m² Area of four doors = 4 x 1.5 x 1.3 = 7.8 m² Area of 3 windows = 3 x 1.5 x 1.2 = 5.4 m² The area of the four walls excluding door and windows = 260 – (7.8 + 5.4) = 260 – 13.2 = 246.8 m² ∵ Cost to paint 1 m² is Rs 3.40 ∴ Cost to paint 246.8 m² = 246.8 x 3.40 = Rs 839.12

The length, breadth and height of a room are 15.35 m, 4.65 m and 6.50 m respectively. If there are 4 doors each of size 1.5 m x 1.3 m and 3 windows each of size 1.5 m x 1.2 m, then find the cost to paint the four walls of room at the rate of Rs 3.40 per sq. m.

Answer»

Here l = 15.35 m, b = 4.65 m and h = 6.50 m

∴ Area of four walls

= 2 x (l + b) x h

= 2 x (15.35 + 4.65) x 6.50

= 2 x 20 x 6.50

= 260 m²

Area of four doors

= 4 x 1.5 x 1.3

= 7.8 m²

Area of 3 windows

= 3 x 1.5 x 1.2

= 5.4 m²

The area of the four walls excluding door and windows

= 260 – (7.8 + 5.4)

= 260 – 13.2

= 246.8 m²

∵ Cost to paint 1 m² is Rs 3.40

∴ Cost to paint 246.8 m²

= 246.8 x 3.40

= Rs 839.12