From a solid cylinder whose height is $2.4 \mathrm{cm}$ and diameter $1.4 \mathrm{cm}$, a conical cavity of the same height and base is hollowed out as shown in the below figure. Find the total surface area of the remaining solid.

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.