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Yes 20 % of China's population is roughly the population. So it's a fancy way of saying that China is five times as big as the U.S. Which it is!

The real interesting comparison lies elsewhere. Also we have to take into account that we can not use the same tests on intelligence on both populations.

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"The real interesting comparison lies elsewhere. Also we have to take into account that we can not use the same tests on intelligence on both populations."

I actually think that intelligence test questions have highly correlated difficulty when given to people from different cultures (even more different than US/China). I.e. there's broad agreement in terms of what questions are hard/easy.

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