Question

The length,breadth and height of the room 5m,4m,and 3m respectively. Find the cost of washing the inner of the room and ceiling at the rate of RS50 per square metre.

Answer 1

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 m
                                        = rs 3700