The base radius and height of a solid me...

The base radius and height of a solid metal cylinder are 12 centimetres and 20 centimeters. By melting it and recasting, how many cones of baseradius 4 centimetres and height 5 centimetres can be made?

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A solid metal cylinder is of base radius 18 çentimetres and height 40 centimetres. By melting this down, how many cylinders of base radius 2 centimetres. and height 5 centimetres can be made?

The base radius and height of a metal. cylinder are 4 centimetres and 10 centimetres. If it is melted and recast. into spheres of radius 2 centimetres each, how many spheres can be made?

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The base radius of an iron cylinder is 15 centimetres and its height is 32 centimetres. It is melted and recast into a cylinder of base radius 20 centimetres. What is the height of this cylinder?'

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