Question

the length breadth and height of a room are 5m,4cm and 3cm respectively.Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50per m^2.
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Answer 1

so length= 5m , breadth= 4m and height = 3m. then , area of the four walls = 2(length+breadth)height ; so, 2 (5+4)3sq m= 2 ×9m×3m = 54sq m and area of the ceiling= length × breadth = 5m ×4m = 20sqm therefore total area to white wash = (54+20)sq m = 74sq m hence, required cost = rupees 7.50 × 74 = Rupees 555

Answer 2

Answer:

Length, breadth and height of a room are 5 m, 4 m and 3 m.

Area of four walls of the room =2h(l+b)

=2×3(5+4) 

=6(9)

=54 sq m

Area of the ceiling =l×b

=5×4

=20 sq cm.

Total area of the four walls and the ceiling of the room

=54+20

=74 sq cm

Cost of white washing = Rs 7.50 per sq m

Total cost of white washing =74×7.50= Rs 555