Question

The length,breadth , and height of a room are 5m , 4m amd 3m respectively find the cost of white washimg the wolls of the room and the ceiling at the rate of ₹7.50 per m2

Answer 1

Given

• Length = 5 m
• Breadth = 4 m
• Height = 3 m
• Washing and ceiling cost = ₹7.50 per m²

To find

• Area to be white washed and ceiling

Solution

⇾ Here, we shall find the white washing and the ceiling so we should find the area of four walls and ceiling, here the room is in the shape of cuboid and the ceiling is in the shape of rectangle. So the area will be :-

• 2(l+b)h+l×b
• 2(5+4)3+5×4
• 18×3+20
• 54+20
• 74

⇾ Hence, the area is 74 m²

• 1 m² - ₹7.50
• 74 m² - ?
• 74 m² - 74 × 7.50
• 74 m ² - ₹555

⇾ Cost of white washing and ceiling is ₹555

Answer 2

Question:

The length,breadth , and height of a room are 5m , 4m amd 3m respectively find the cost of white washimg the wolls of the room and the ceiling at the rate of ₹7.50 per m2

Solution:

Area to be pointed=5⋅4+2(h⋅l)+2(b⋅h)

=20+2(3⋅5)+2(3⋅7)

=92m2

1m2=7.50Rs

92m2=690Rs.