Q4 of 24 Page 164

Find the area of four walls of a room having length, breadth, and height as 8 m, 5 m, and 3 m respectively. Find the cost of whitewashing the walls at the rate of Rs. 15/m2.

Given, a room with length, breadth, and height as 8 m, 5 m, and 3 m respectively and the cost of


whitewashing the walls per m2 is Rs. 15.


We know, Area of four walls = 2×(l+b)×h


∴ Area of four walls = 2×(l+b)×h


= 2×(8+5)×3


= 2×13×3


= 78 m2


∴ Cost of white washing the walls at the rate of Rs. 15/m2= 15×78


= Rs. 1170


More from this chapter

All 24 →
2

Two cubes, each of volume 512 cm3 are joined end to end. Find the lateral and total surface areas of the resulting cuboid.

 3

The length, breadth, and height of a cuboid are in the ratio 6:5:3. If the total surface area is 504 cm2, find its dimension. Also, find the volume of the cuboid.

 5

A room is 6 m long, 4 m broad and 3 m high. Find the cost of laying tiles on its floor and four walls at the cost of Rs. 80/m2.

 6

The length, breadth, and height of a cuboid are in the ratio 5:3:2. If its volume is 35.937 m3, find its dimension. Also, find the total surface area of the cuboid.