The length of a room is 3 times its height and breadth is 14 times its

1.	The length of a room is 3 times its height and breadth is 14 times its height. The cost of whitewashingthe walls at the rate ofäš1.50 per sq. m is? 216. Find the dimensions of the room.
Answer» Area of walls=Curved surface area of cuboid=2(l+b)h=2(3h+3h/2)h=2(8h/2)h=8h² Cost of 1m²=1.50RsArea covered in 216Rs=216/1.5=144m² 144=8h²h²=18h=3√2

The length of a room is 3 times its height and breadth is 14 times its height. The cost of whitewashingthe walls at the rate ofäš1.50 per sq. m is? 216. Find the dimensions of the room.

Answer»

Area of walls=Curved surface area of cuboid=2(l+b)h=2(3h+3h/2)h=2(8h/2)h=8h²

Cost of 1m²=1.50RsArea covered in 216Rs=216/1.5=144m²

144=8h²h²=18h=3√2