The radius of a spherical balloon increases from $12 \mathrm{cm}$ to $16 \mathrm{cm}$ as air being pumped into it. Find the ratio of the surface area of the balloons in the two cases.

A sphere, a cylinder and a cone as given below figures are of the same radius, whereas cone and cylinder are of same height. Find the ratio of their curved surface areas.

 An industrial metallic bucket is in the shape of the frustum of a right circular cone whose top and bottom diameters are $10 \mathrm{m}$ and $4 \mathrm{m}$ and whose height is $4 \mathrm{m}$. Find the curved and total surface area of the bucket.