Find the area of the four walls of the room whose length, breadth and

1.	Find the area of the four walls of the room whose length, breadth and height are 8 m, 6 m and 5 mrespectively. Ignoring the door, windows and other openings, find the cost of whitewashing the wallsat the rate of 7 per sq. m
Answer» Area of four walls= 2 (lengthheight + breadthheight) Length = 8 m, Breadth = 6 m, Height = 5 m Then,Area of four walls = 2(85 + 65)= 2(40 + 30)= 270 = 140 m^2 Cost of painting = 1407= Rs 980

Find the area of the four walls of the room whose length, breadth and height are 8 m, 6 m and 5 mrespectively. Ignoring the door, windows and other openings, find the cost of whitewashing the wallsat the rate of 7 per sq. m

Answer»

Area of four walls= 2 (length*height + breadth*height)

Length = 8 m, Breadth = 6 m, Height = 5 m

Then,Area of four walls = 2(8*5 + 6*5)= 2(40 + 30)= 2*70 = 140 m^2

Cost of painting = 140*7= Rs 980