The sub-duplicate ratio of 64:81 is_____.

Write True or false : (a) The duplicate ratio of 1 : ab is 1 : a^(2)b^(2) (b) The sub-duplicate ratio of 4:9 is 3:2.

The duplicate ratio of 4:5 is

The duplicate ratio of 4:5 is

Find the sub-duplicate ratio of 4:9 .

Find the sub-duplicate ratio of 81 : 64.

Sub-triplicate Ratio

Find the : (i) duplicate ratio of 2sqrt(2) : 3sqrt(5) (ii) triplicate ratio of 2a : 3b , (iii) sub-duplicate ratio of 9x^(2)a^(4) : 25y^(6)b^(2) (iv) sub-triplicate ratio of 216 : 343 (v) reciprocal ratio of 3: 5 (vi) ratio compounded of the duplicate ratio of 5 : 6 , the reciprocal ratio of 25 : 42 and the sub-duplicate ratio of 36 : 49 .

The sub-duplicate ratio of (7+4sqrt3): (7-4sqrt3) is