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The point P(a,b) is such that b - 25a = ...

The point P(a,b) is such that b - 25a = 4 and the arithmetic mean of a and b is 28. Q(x, y) is the point such that x and y are two geometric means between a and b, if O is the origin then `OP^2 + OQ^2` is equal to `205k^2` when k =

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