Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Cornelia amezitembelea nchi 42 - 20 - 10 = <<42-20-10=12>>12 ambazo hazikuwa Ulaya au Amerika Kusini.
Kati ya hizo nchi 12, nusu yao, au 12 / 2 = <<12/2=6>>6 zilikuwa Asia.
Cornelia amezitembelea nchi 6 za Asia.