Answers

2014-09-22T12:39:23+05:30
The duplicate ratio of 3:4 is 3^2/4^2 = 9/16. 
The triplicate ratio of 2:3 is 2^3/3^3 = 8/27.

Now we have 4 ratios: 4:9, 9:16, 8:27 and 9:7.

We have to calculate the ratio compounded of all these ratios.

That will be (4 x 9 x 8 x 9)/(9 x 16 x 27 x 7) = 2/21.

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Will u explain it..
first 4 is multiplied wit 3 square( ie duplicate of 3)
then 2 is cubed (i.e triplicate of of 2)
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sry fr more modifications