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642. A hemispherical howl of internal radius 9 cm is full of liquid. The liquid is to be filled into cylindrical shaped small bottles each at diameter 3 cm and height 4 cm. How many bottles are needed to empty the bowl?

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643. A tent is in the shape of a right circular cylinder upto a height of 3 m and conical above it. The total height of the tent is 13.5 m and radius of base is 14 m. Find the cost of cloth required to make the tent at the rate of Rs. 80 per sq. m.

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644. The radii of circular ends of a solid frustum of a cone are 33 cm and 27 cm and its slant height is 10 cm. Find its total surface area.

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645. The base radius and height of a right circular solid cone are 2 cm and 8 cm respectively. It is melted and recast into spheres of diameter 2 cm each. Find the number of spheres so formed.

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646. A tent is in the form of a cylinder of diameter 4.2 m and height 4 m surmoun-ted by a cone at equal base and height 2.8 m. Find the capacity of the tent and the cost of canvas for making the tent at Rs. 100 per sq. m.

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647. It the radii of the ends of a bucket, 45 cm high, are 28 cm and 7 cm, determine total surface area of the bucket.

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648. A solid metal cone, with radius of base 12 cm and height 24 cm, is melted to form spherical solid balls of diameter 6 cm each. Find the number of balls thus formed.

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649. A bucket is in the form of a frustum of a cone its depth is 15 cm and the diameter of the top and the bottom are 56 cm and 42 cm respectively. Find how many litres of water can the bucket hold (use