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Question

Find the ratio compounded of
(1) the ratio 2a, 3b, and the duplicate of 9b2:ab.
(2) the subduplicate ratio of 64 : 9, and the ratio 27 : 56.
(3) the duplicate ratio of 2ab:Ca2b2, and the ratio 3ax : 2by .

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Solution

(1) Duplicate of 9b2:ab is equal to 81b4:a2b2
The compound of 2a:3b and the duplicate of 9b2:ab is 2a×81b4:3b×a2b2=54b:a
(2) Sub duplicate ratio of 64:9 is 8:3
The compound of the sub duplicate ratio of 64:9 and the ratio 27:56 is 8×27:3×56=9:7
(3) Duplicate ratio of 2ab:ca2b2 is equal to 4a2b2:ca4b4
The compound of the duplicate of ratio 2ab:ca2b2 and the ratio 3ax:2by is 4a2b2×3ax:ca4b4×2by=6bx:acy

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