The sub-duplicate ratio of 81:64 is:

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8:9

4:9

9:8

7:8

answer is C.

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Detailed Solution

Concept: We can find the sub-duplicate ratio in this situation by applying ratio ideas.
Let's assume that the ratio 81:64 is a: b, with a = 81 and b = 64. Since we are aware, the sub-duplicate ratio can be written as

if the ratio is given in the form a:b.
Thus,

As a result, the 81:64 sub-duplicate ratio is 9:8.
Hence, the correct answer is 3.

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