53. The radii of two cylinders are in the ratio 3: 5 and their heights are in tbe ratio of 2 : 3. Find the ratio of their curved surface areas.
A.5.2 B.2.5
C.1.5 D.None
Answer:
Let the radii of the cylinders be 3x, 5x and their heights be 2y, 3y respectively. Then
Ratio of their curved surface area = 2? X 3x X 2y = 2/5 = 2.5
