Question

The dimensions of a room are 9 m × 8 m × 6.5 m. It has one

door of dimensions 2 m × 1.5 m and two windows each of

dimensions 1.5 m x1 m. Find the cost of white washing the

walls at $6.40 per m square ​

Answer 1

Answer:

rs:1376

Step-by-step explanation:

Solution:

Length of a room = 9 m

Breadth of a room = 8 m

Height of a room = 6.5 m

∴ Area of 4 walls = Lateral Surface Area

Lateral surface area of the room

= 2(l + b) × h

= [2(9 + 8) × 6.5]

= (2 × 17 × 6.5)

= 221 m²

∴ Area not white washed

= (Area of One Door) + (Area of 2 Windows)

= (2 × 1.5) + (2 × 1.5 × 1)

= 3 + 3

= 6 m²

∴ Area whitewashed

= (221 – 6)

= 215 m²

∴ Cost of Whitewashing the Walls at the Rate of Rs.6.40 per Square Meter

= Rs. (6.40 × 215)

= Rs. 1376