The dimensions of a shop are 12 ft `xx` 8 ft `xx` 5 ft. The area of four walls is _______

The dimensions of a class room are 15 ft xx 10 ft xx 11 ft. The area of four walls is ______.

The inner dimensions of a hall are 40 ft xx 20 ft xx 30 ft. The hall contains 2 doors of size 5 ft xx 10 ft each and 4 windows of size 5 ft xx 5 ft each. If the inner walls of the hall are to be fixed by tiles of size 1 ft. xx 1, then find the number of tiles required.

The dimensions of a room are 20 ftxx 15 ftxx 12ft . Find the cost of painting the walls of the room at rupees 20 per sq. ft.

The floor dimensions of a conference hall are 100 ft xx 20 ft. Find the number of tiles required for flooring with square tiles of side 2 ft each.