If the ratio of the volume of two spheres is 1 : 8, find the ratio of their surface areas.

The weight of a metallic right circular cylinder with base radius 10.5 cm and height 60 cm, it being given that 1 cm³ of metal weighs 5 gm, is :

1. 48.75 kg

2. 97.65 kg

3. 102.45 kg

4. 103.95 kg

The radius of a roller 100 cm long is 14 cm. The curved surface area of the roller is :

1. 13200 cm²

2. 15400 cm²

3. 4400 cm²

4. 8800 cm²

The ratio between the radius of the base and the height of a cylinder is 2 : 3. If its volume is 1617 cm³ the total surface area of the cylinder is :

1. 308 cm²

2. 462 cm²

3. 540 cm²

4. 770 cm²