504 cones each of diameter 3.5cm and height 3 cm melted and recast into a metallic sphere. Find the diameter of the sphere and hence find the total surface area of the sphere. (take pi = 22/7)

The radius of the base of a right circular cylinder is halved and the height is doubled. What is the ratio of the volume of the new cylinder to that of the volume of the original cylinder?

A tent is a cylinder to a height of 4.8 m and conical above it. The radius of the base is 4.5 m and the total height of the tent is 10.8 m. Find the canvas required for the tent in square meters.

Two cylindrical vessels are filled with milk. The radius of a vessel is 15 cm and height is 40 cm the radius of another vessel is 20 cm and height is 45 cm. Find the radius of another cylinder vessel of height 30 cm which may just contain the milk which is in the two given vessels.

The height of a tent is 9m it's Base diameter is 24m what is slant height. Find the cost of the canvas cloth required if it costs 14 per Sq.m