Question

what is the cost of white washing ba room 10m×8m×3m, if the rate of white washing is Rs. 20 per meter sq. (Assume all 4 wall and roof need to be white washed):-

Answer 1

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Here is the solution:

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Find the area of the ceiling:

Area = Length x Breath

Area = 10 x 8 = 80 m²

Find the area of the 4 walls:

Area = 2( length + breadth) x height

Area = 2( 10 + 8)  x 3

Area = 2(18)  x 3

Area = 36 x 3

Area = 108 m²

Find the total area:

Area = 80 + 108 = 188 m²

Find the cost of white washing:

1 m² = Rs 20

188 m² = 20 x 188 = Rs 3760

Answer: It will cost Rs 3760