The radii of two cylinders are in the ratio 2:3 and their heights are in the ratio 5:3. Calculate the ratio of their volumes and the ratio of their curved surfaces.
Given,
Ratio of radii of two cylinders = R1 : R2 = 2 : 3
Ratio of their heights = H1 : H2 = 5 : 3
∴ Ratio of volumes of cylinders = 
∴ Ratio of their curved surface area = 
12