Volume of a Sphere

A spherical ball of lead, $3 \mathrm{cm}$ in radius is melted and recast into three spherical balls. The radius of two of these are $1.5 \mathrm{cm}$ and $2 \mathrm{cm}$ respectively. The radius of the third ball is

The volume of two spheres are in the ratio $64:27$. the difference of their surface areas, if the sum of their radii is $7$ units, is ______

A hemispherical bowl is filled to the brim with a beverage. The contents of the bowl are transferred into a cylindrical vessel whose radius is $50\%$ more than its height. If the diameter is same for both the bowl and the cylinder, then the amount of the beverage that can be poured from the bowl into the cylindrical vessel is