Question

The radii of two cylinders are in the ratio 3 : 5. If their heights are in the ratio 2 : 3, then the ratio of their curved surface areas is

(a) 2 : 5

(b) 5 : 2

(c) 2 : 3

(d) 3 : 5

Answer 1

Given that

and

Then,

The ratio of C.S.A. of cylinders

Hence, the correct answer is choice (a).