if p:q is the sub duplicate ratio of p-x^2 : q-x^2 then x^2 is ??
a) p/p+q
b) q/p+q
c) pq/p+q
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answer is option (c)
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sudki11:
i didn't understand the second step ..the rule
like in this case we are finding the sub duplicte for p-x^2: q-x^2 to find x^2
like how is p: q is the sub- duplicate ratio of p-x^2 : q-x^2...what happened to x
the ratio compounded of 4:9, the duplicate ratio of 3:4 ,the triplicate ratio of 2:3 and 9:7 is
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