A spherical ball of lead 3 cm in diameter, is melted and recast into three spherical balls. The diameter of two of these balls are 1.5 cm and 2 cm respectively. Then, the diameter of the third ball is

If height of a cone is tripled and radius is doubled then its volume will become ----- times.

Volumes of two spheres are in the ratio 64:27. The ratio of their surface area is

Volume of hollow hemispherical shell of  radii R and r is equal to

A wooden article was made by scooping out a hemisphere from each end of a cylinder. If the height of the cylinder is 10cm and its base is of diameter 7cm, find the total surface area of the article when it is ready.

The diameter of a garden roller is 1.4m and it is 2m long. How much area will it cover in 5 revolutions?  (Take Π=22/7)

The length of a cold storage is double its breadth. Its height is 3m. The areas of its four  walls is 108m². Find its volume.

If radius of a sphere is doubled then its volume becomes ---- times.

12 spheres of the same size are made by melting a solid cylinder of 16cm diameter and 2cm height. Then, the diameter of each sphere is

A cubical block of side 7cm is surrounded by a hemisphere. What is the greatest diameter the hemisphere can have? Find the surface area of the solid.