Question

THE FOUR WALLS OF AN AUDITORIUM OF DIMENSIONS 18.4MX12.6MX11.5M HAVE TO BE PAINTED. FIND THE COST OF PAINTING AT THE RATE OF ₹38 PER SQ.M

Answer 1

Step-by-step explanation:

THE FOUR WALLS OF AN AUDITORIUM OF DIMENSIONS 18.4MX12.6MX11.5M HAVE TO BE PAINTED. FIND THE COST OF PAINTING AT THE RATE OF ₹38 PER SQ.M

Answer 2

Step-by-step explanation:

Length, l = 5 m

Breadth, b = 4 m

Height, h = 3 m

Surface area of 5 faces = Area of the 4 walls and ceiling = lb + 2(l + b)h

lb + 2(l + b)h = (5 m × 4 m) + 2 × (5 m + 4 m) × 3 m

= 20 m² + 2 × 9 m × 3 m

= 20 m² + 54 m2

= 74 m²

The cost of whitewashing the walls of the room and ceiling = Rate × Area

= ₹ 7.50 / m² × 74 m2

= ₹ 555

Thus, the cost of whitewashing the walls of the room and the ceiling is ₹555.