if a1/x=b1/y=c1/z, b2=ac then find the value of (x+z)/2y?
​and how

Here is the similar link for the answer to your query:

https://www.meritnation.com/ask-answer/question/1-25x-1-22x-1-100-find-x2-x-21-3-2/number-systems/2875806

Please check solution number 5 in the above given link. 

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