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The answer will depend on what you are trying to compare the number of blacks in the US with:the number of non-blacks in the USthe number of blacks living outside the US.
No. There is no platinum ratio.
The ratio is 1:2The ratio is 1:2The ratio is 1:2The ratio is 1:2
The ratio of C12H22O11 to WHAT!
The ratio of volumes is directly proportional to the cube of the ratio of their sides. And, incidentally, all cubes are similar.