The ratio of volume of two cylinders of the same height is 49 : 64. The ratio of their curved surface area is
49 : 64
8 : 9
7 : 8
7 : 9
The areas of two similar triangles are 49 cm2 and 64 cm2 respectively. The ratio of their corresponding sides is
The ratio compounded of the duplicate ratio of 8 : 7, the sub-duplicate of 9:64 and the reciprocal of 24 : 49 is