Question

2.
The length, breadth and height of a room are 5 m, 4 m and 3 m
room are 5 m, 4 m and 3 m respectively. Find
the cost of white washing the inner of the room and ceiling at the rate of 5
per square metre.​

Answer 1

Answer:

3700

Step-by-step explanation:

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



Answer 2

Step-by-step explanation:

total area of the room

=2*{5*4 + (5*3) + 3*4}=94 m^2

cost of washing the room = 5*94=470