The length of a room is three times its breadth and height is 4.6m. If the cost of carpeting its floor at Rs 60 per sq. m. is Rs 4500, find the cost of colouring the walls at Rs 60 per sq.m.
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Area of floor=4500/60=75 m^2
Width =x, Length =3x, Area of the floor.
= x × 3x = 3x^2
3x^2 = 75
=> x^2 = 25
=> x = 5 m,
Width = 5 m
Length = 3×5 = 15 m
Walls area = 2(5 + 15) × 4.6 = 184 m^2
Cost of colouring = 184 × 60 = ₹11,040
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