Why there is a shine on the walls after two three days of white washing ?

A door of length 2 m and breadth 1m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m . Find the cost of white washing the wall, if the rate of white washing the wall is Rs. 20 per m^2 .

What chemical reactions occurs on the walls after white wash?

The internal measures of a cuboidal room are 12 m xx 8 m xx 4 m . Find the total cost of whitewashing all four walls of a room, if the cost of white washing is Rs 5 per m^2. What will be the cost of white washing if the ceiling of the room is also whitewashed.

A dome of a building is in the form of a hemisphere. From inside, it was white ¬ washed at the cost of Rs 498.96. If the cost of white-washing is at the rate of Rs 2.00 per square metre, find the inner surface area of the dome.

A dome of a building is in the form of a hemisphere. From inside, it was white ¬ washed at the cost of Rs 498.96. If the cost of white-washing is at the rate of Rs 2.00 per square metre, find the volume of the air inside the dome.

Length of a room is 1 1/3 times its breadth and its height is 1/2 times its length. The cost of white washing the walls at the rate of Rs 2.60per m^2 is Rs 291.20. find the cost of tiling the floor at the rate of Rs 8 per m^2 .

A class room is 7 m long, 6.5 m wide and 4 m high. It has one door 3mxx1.4m and three windows 2mxx1m . The interior walls are to be white rushed. The contractor charges Rs 10.50 per square metre. Find the total cost of white washing.

Why is the foundation of wall made wider?