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61. Find the volume of the following cuboids.

(i) Base area = 8 cm x 3 cm
Height = 2 cm
∴ Volume of the cuboid = (8 cm x 3 cm) x 2 cm
= 48 cm³
(ii) Base area = 24 m²
Height = 3 cm
∴ Volume of the cuboid = Base area x Height
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$equals space 72 over 100 straight m cubed space equals space 0.72 space straight m cubed$

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62. Find the volume of the following cubes.
(a) with a side 4 cm (b) with a side 1.5 m.

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Long Answer Type

63.

A company sells biscuits. For packing purpose they are using cuboidal boxes:
box A $rightwards arrow$ 3 cm x 8 cm x 20 cm, box B $rightwards arrow$ 4 cm x 12 cm x 10 cm. What size of the box will be economical for the company? why? Can you suggest any other size (dimensions) which has the same volume but is more economical than these?

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Short Answer Type

64. Find the volume of the following cylinders.

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65.

Given a cylindrical tank, in which situation will you find surface area and in which situation volume.
(a) To find how much it can hold.
(b) Number of cement bags required to plaster it.
(c) To find the number of smaller tanks that can be filled with water from it.

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66. Find the height of a cuboid whose base area is 180 cm² and volume is 900 cm³.

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67. A cuboid is of dimensions 60 cm X 54 cm x 30 cm. How many small cubes with side 6 cm can be placed in the given cuboid?

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68. Find the height of the cylinder whose volume is 1.54 m³ and diameter of the base is 140 cm?

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69.

A milk tank is in the form of cylinder whose radius is 1.5 m and length is 7 m. Find the quantity of milk in litres that can be stored in the tank?

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70.

If each of a cube is doubled,
(i) How many times will its surface area increase?
(ii) How many times will its volume increase?

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