Cornelia likes to travel. She visited already 42 different countries. 20 of them were in Europe and 10 in South America. From the rest of the countries, only half of them were in Asia. How many Asian countries has Cornelia visited?
Cornelia visited 42 countries - 20 countries - 10 countries = <<42-20-10=12>>12 countries which were outside of Europe and South America.
Half of those 12 countries were in Asia, so there were 12 countries / 2 = <<12/2=6>>6 Asian countries that Cornelia visited.
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