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Either way you get the same outcome, no upside to either choice

This is far from a genius question? I would put it by basic addition?

20 testicles / breasts divided by 10 males / females = 2.

False. If 10 guys (2 testicles) or 10 girls (2 breasts) were averaged, that would be 20 testicles / breasts, which would mean each person averages 2 testicles / breasts.