Question

A conference hall is 14m long, 8m wide and 4m high. There are four windows and one door in it. The
door measures lm by 2m and each window measures lm by 1.5m.
a) How many litres of are needed to paint all the walls of the hall if one litre is enough for covering
18m2
b) What will the cost of painting the hall if 1 litre of paint costs Rs. 225?​

Answer 1

Answer:

(a) 28/3 Litres                            

(b) Rs. 2100

Explanation:

⇒ Surface Area of walls = 2H×(L+B)

                                        = 2×4×(14+8)

                                        = 8×22

                                        = 176 m²

⇒ Area of walls to be painted = Area of 4 walls - (Area of 4 windows +                Area of 1 door)

                                                  = 176 m² - [4×(1×1.5) + 1×(1×2)]

                                                  = 176 m² - [6 + 2]m²

                                                  = 176 m² - 8 m²

                                                  = 168 m²

⇒ Litres of paint required for 18 m²   = 1 L

   Litres of paint required for 168 m² = 168÷18

                                                             = 28/3 Litres             ←ANSWER

⇒ Cost of 1 Litre paint            = Rs. 225

∴ Cost of 28/3 Litres of paint = [28/3]×225

                                                = Rs. 2100                 ←ANSWER

PLEASE MARK AS THE BRAINLIEST!!!!!