14. A laboratory is 9 m long, 8 m broad and 6 m high. It has 2 doors c

1.	14. A laboratory is 9 m long, 8 m broad and 6 m high. It has 2 doors cach of size 3 m x 1.5 m and fourwindows each of size 1.5 m x 1 m. Find the cost of whitewashing the walls of the laboratory at the rateof 1.75 per sq. m
Answer» Area of four walls of laboratoryAr= 2 (lengthheight + breadthheight)= 2(96 + 86) = 2(54 + 48)= 2(102) = 204 m^2 Area of window Aw = 1.51 = 1.5 m^2 Area of door Ad = 31.5 = 4.5 m^2 Area for white washing = Ar - 2Ad - 4Aw= 204 - 24.5 - 41.5= 204 - 9 - 6= 204 - 15= 189 m^2 Cost of white washing = 189*1.75 = Rs 330.75

14. A laboratory is 9 m long, 8 m broad and 6 m high. It has 2 doors cach of size 3 m x 1.5 m and fourwindows each of size 1.5 m x 1 m. Find the cost of whitewashing the walls of the laboratory at the rateof 1.75 per sq. m

Answer»

Area of four walls of laboratoryAr= 2 (length*height + breadth*height)= 2(9*6 + 8*6) = 2(54 + 48)= 2(102) = 204 m^2

Area of window Aw = 1.5*1 = 1.5 m^2

Area of door Ad = 3*1.5 = 4.5 m^2

Area for white washing = Ar - 2*Ad - 4*Aw= 204 - 2*4.5 - 4*1.5= 204 - 9 - 6= 204 - 15= 189 m^2

Cost of white washing = 189*1.75 = Rs 330.75