Page 2 - Worksheet-1 Ch-13-Surface Areas and Volumes [Cuboid and cubes]

15. A wall of length 10 m is to be built across an open ground. The height of the wall 3
is 5 m and thickness of the wall is 42 cm. If this wall is to be built with bricks of
dimensions 42 cm x 12 cm x 10 cm, then how many bricks would be required?

16. If a wooden box of dimensions 8 m x 7 m x 6 m is to carry boxes of dimensions 3
8 cm x 7 cm x 6 cm, then find the maximum number of boxes that can be carried
in the wooden box.

17. Rinku has built a cuboidal water tank in his house. The top of the water tank is 4
covered with an iron lid. He wants to cover the inner surface of the tank
including the base with tiles of size 10 cm by 8 cm. If the dimensions of the
water tank are 180 cm x 120 cm x 60 cm and cost of tiles is Rs. 480 per dozen,
then find the total amount required for tiles.

18. Mary wants to decorate her Christmas tree. She wants to place the tree on a 4
wooden box covered with coloured paper with picture of Santa Claus on it.
She must know the exact quantity of paper to buy for this purpose. If the
length, breadth and height of a cuboidal box are 80 cm, 40 cm and 20 cm
respectively. How many square sheets of paper of side 40 cm would she
require?
19. Ajay has built a cubical witter tank in his house. The top of the water tank is 4
covered with lid. He wants to cover the inner surface of the tank including the lid
with square tiles of side 25 cm. If each inner edge of the water tank is 2 m long
and tiles costs Rs 360 per dozen, then find the total amount required for tiles.

20. A cube and a cuboid have the same volume. The dimensions of the cuboid are 4
in the ratio 1:2: 4. If the difference between the cost of painting the cuboid and
cube (whole surface area) at the rate of Rs 5 per m is Rs 80. Find their
2
volumes.

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