Question

A room is 14m long, 9.5m broad and 4m high. It has 3 windows
each of dimension 1.4m by 0.75m, Find the cost of white washing the
walls of the room at the rate of Rs 18 per m².​

Answer 1

cost of distempering the walls is Rs. 3273.3

Step-by-step explanation:

length of the room = 14 m

breadth of the room = 9.5 m

height of the room = 4 m

area of four walls = 2(l+b)h

= 2(14+9.5) × 4

= 8 ×23.5

= 188 m²

length of the door = 2 m

breadth of the door = 1.5 m

area of the one door = l×b

= 2×1.5

= 3 m²

length of the window = 1.4 m

breadth of the window = 75 cm = 0.75 m

area of the three windows = 3(l×b)

= 3(1.4 × 0.75)

= 3×1.05

= 3. 15 m²

area of the wall to be distempered = area of four walls - (area of one door + area of the three windows)

area of the wall to be distempered = 188 -(3+3.15)

= 188 - 6.15

= 181.85 m²

cost of distempering 1 m² = Rs. 18

MARK BRAINLIEST

LIKE

RATE

FOLLOW

cost of distempering 181.85 m² = 181.85 × 18 = Rs. 3273.3

hence ,

cost of distempering the walls is Rs. 3273.3

Answer 2

Answer:

• Cost of whitewashing the walls of the room is ₹3327.3

Step-by-step explanation:

Given that:

• Length of the room = 14 m
• Breadth of the room = 9.5 m
• Height of the room = 4 m
• There are three windows in the room.
• Dimension of each window is 1.4 m by 0.75 m.
• Cost of whitewashing is ₹ 18/m².

To find:

• Cost of whitewashing the walls of the room.

Formulas Used:

Area of 4 walls of a room:

$\sf{= 2(L + B)\times H}$

Area of rectangle:

= (L × B)

Where,

• L = Length
• B = Breadth
• H = Height

Solution:

Area of walls of the room:

$\sf{=2(14+9.5)\times4}$

Adding 14 and 9.5,

$\sf{=2(23.5)\times4}$

Opening the brackets,

$\sf{= 47\times4}$

Multiplying 47 and 4,

$\sf{=188}$

Hence, area of the walls of the room is 188 m².

Area of 1 window = (1.4 × 0.75)

= 1.05

∵ Area of 1 window is 1.05 m².

∴ Area of 3 windows = (1.05 × 3)

= 3.15 m²

Actual area of the walls of the rooms:

= (188 - 3.15) m²

= 184.85

Cost of whitewashing the walls at ₹ 18/m²:

= ₹(184.85 × 18)

= ₹ 3327.3

Hence, cost of whitewashing the walls of the room is ₹3327.3