Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the
cost of white washing the walls of the room and the ceiling at the rate of rs. 7.50 per m²
​

Answer 1

PLS MARK ME THE BRAINLIEST ANSWER

LENGTH= 5m

Breadth = 4m

height. = 3m

total area for white washing is

Csa+base area

we get

2(l+b)h + lb

2(5+4)3 + 5*4

54+20

74m^2

therefore cost if whitewashing is

74×7.5= ₹555

HOPE I HELPED YOU

Answer 2

Given :-

• The length, breadth and height of a room are 5 m, 4 m and 3 m respectively
• Rate of Whitewashing = Rs 7.50per m

To Find :-

• Total Cost of Whitewashing

Solution :-

It is given that, walls and ceiling is to be whitewashed . Therefore :

⟾ Total Area of Walls :

• Total Area = 2H × ( L + B )
• Total Area = 2 × 3 ( 5 + 4 )
• Total Area = 2 × 3 × 9
• Total Area = 6 × 9
• Total Area of Walls = 54m²

⠀

⟾ Total Area of Ceiling :

• Total Area = Length × Breadth
• Total Area = 5 × 4
• Total Area = 20m²

⠀

⟾ Total Area to be WhiteWashed

• Area of Walls + Area of Ceiling
• 54 + 20 = Total Area
• 74m² = Total Area

Thus 74m² is to be WhiteWashed

⠀

Now,

➞ Cost of 1m² Whitewashing = Rs 7.50

➞ Cost of 74m² Whitewashing = 7.50 × 74

➞ Cost of 74m² Whitewashing = Rs 555

Thus Cost of 74m² Whitewashing is Rs 555

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