Quantitative Reasoning question... 25x is to 40y as 25y is to what?

[Hammer Time]

So, 25x is to 40y as 25y is to what?

The answer is 40y^2/x I just have no idea how to get there. Any help? Thanks!

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[cdp1210]

25x/40y = 25y/z Solve for z. See if you can figure it out with that.

 

[Hammer Time]

25x/40y = 25y/z Solve for z. See if you can figure it out with that.

Thanks mate