Question

The length,breadth and height of a room are 5m,4m,3m respectively.Find the cost of white washing the walls of the room and the ceiling at the rate of Rs7.50 per m²....plss answer it fast..
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Answer 1

Step-by-step explanation:

given that,

length = 5 m 

breadth = 4 m 

height = 3 m 

area of wall = 2h (L+  b)

                     = 2×3 (4 +5 )

                     = 6×9

                     = 54 sq m

area of cieling = l×b

                         = 5 ×4 

                        = 20 sq m

total area= area of cieling + area of cieling 

               = 54 + 20 sq m

               = 74 sq m

cost of white washinf for 1 sq m = rs 50

             so for 74 sq m = 50 × 74 sq 

Answer 2

l=5m

b=4m

h=3m

lsa+l*b=2*(l+b)*h+l*b

=2*(5+4)*3+5*4

=2*9*3+20

=54+20

=74

cost of white washing 1m=rs 7.5

cost of 74m=7.5*74=rs555

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