surface area and volumie 0I tio8 A room is 6m long, 5m wide and 4m hig

1.	surface area and volumie 0I tio8 A room is 6m long, 5m wide and 4m high. The doors and windows in the roomoccupy 4 square metres of space. Find the cost of papering the remaining portion ofthe walls with paper 75cm wide at the rate of 2.40 per metre.
Answer» Given,Room length l = 6m, breadth b = 5m, height h = 4m Surface area of walls= 2(lh + bh)= 2(64 + 54) = 2(24 + 20)= 88 m^2 Portion of walls for papering= 88 - 4 = 84 m^2 Now length of paper required = 84/.75= 8400/75 = 112 m Cost of paper required = 112*2.40= Rs 268.8

surface area and volumie 0I tio8 A room is 6m long, 5m wide and 4m high. The doors and windows in the roomoccupy 4 square metres of space. Find the cost of papering the remaining portion ofthe walls with paper 75cm wide at the rate of 2.40 per metre.

Answer»

Given,Room length l = 6m, breadth b = 5m, height h = 4m

Surface area of walls= 2(l*h + b*h)= 2(6*4 + 5*4) = 2(24 + 20)= 88 m^2

Portion of walls for papering= 88 - 4 = 84 m^2

Now length of paper required = 84/.75= 8400/75 = 112 m

Cost of paper required = 112*2.40= Rs 268.8