How many silver coins 1.75 cm in diameter and of thickness 2mm,must be melted to form a cuboid of diamensions `5.5cmxx10cmxx3.5cm`?

How many silver coins 1.75 cm in diameter and of thickness 2 mm must be melted to form a cuboid of dimension 5.5 cm xx 10 cm xx 55 cm .

Find how many spherical cartridges of diameter 4.2 cm.each can be made from a solid cuboid of size 66cmxx42cmxx21cm?=58212cm^3

How many coins of diameter 1.5 cm and thickness 0.2 cm can be made by melting a right circular metallic solid cylinder of height 10 cm and diameter 4.5cm?

How many regular pieces of wood of length 2m.breadth 2.5cm and thickness 4 cm.can be obtained from a log of wood of length 6m.,breadths 15cm and thickness 40 cm.?

The focal lenghts of objectives and eyepiece of a telescope are 200cm and 10 cm respectively. Is is used to get an image of the Sun on a screen placed 40cm behind the eyepiece. The diameter of the image is 6cm. What is the diameter of the Sun? Give the distance from earth to the Sun is 1.5xx10^(11)m .

A solid metallic sphere of diameter 21 cm is melted and recast into a number of smaller cones, each of diameter 3.5 cm and height 3 cm. Find the number of cones so formed.

A metallic sphere of radius 10.5cm is melted and then recast into small cones each of radius 3.5cm and height 3cm.The number of such cone is__-

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0 ^@C . What is the change in the diameter of the hole when the sheet is heated to 227 ^@C ? Coefficient of linear expansion of copper = 1.70 xx 10^-5 K^-1 .

A spherical glass vessel has a cylindrical neck 8 cm long,2 cm in diameter,the diameter of the spherical part is 8.5cm.By measuring the amount of water it holds,a child finds its volume to be 345cm^3 .Check whether she is correct,taking the above as the inside measurements,and pi=3.14 .

How many numbers of four digit can be formed out the digits 1,2,3,4,5,6 without repitition of digits?