$6=2*3$, $15=3*5$ and $12=2^2*3$, so "Israeliness" is the ratio of the exponent of 2 to the sum of the exponents in the prime factor expansion of the given number. Same with Chineseness and 3, Americanness and 5. Therefore, 10 is 1/2 Israeli and 1/2 American.
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