Question

what will be the cost of white washing of a square room of 15 m length and 15 m height if the rate of white washing of walls is rs 2 per sq .m and that of roof is rs 4.50 per sq .m​

Answer 1

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We are given that the height of the cuboidal room = h = 4m

Length of the cuboidal room = l = 10m

Breadth of the cuboidal room = b = 4m

So, by substituting the value of l = 10m b = 4m and h = 4m in equation (i), we get,

Lateral surface area or area of four walls of the cuboidal room = 2h (l + b)

=2×4(10+4)

=8(14)

=112m2

So, we get the area of the four walls of the cuboidal room as 112m2

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