Question

AREAS AN
EXERCISE 13.1
213
Touch of white washing the walls of the room and the ceiling at the rate of
7.50 per m
container?
cubical box has each edge 10 cm and another cuboidal box is 12.5 cm long, 10
ide and 8 cm high
A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the
top. Ignoring the thickness of the plastic sheet, determine:
(1) The area of the sheet required for making the box.
(ii) The cost of sheet for it, if a sheet measuring Im costs Rs 20.
The floor of a rectangular hall has a perimeter 250 m. If the cost of painting the four
walls at the rate of 10 per m’is* 15000, find the height of the hall.
(Hint: Area of the four walls =Lateral surface area.]
The paint in a certain container is sufficient to paint an area equal to 9.375 m. Ho-
The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the
many bricks of dimensions 22.5 cm x 10 cm x 7.5 cm can be painted out of the​

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