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

### Instruction:
Paul is working at a university. He is part of a big project, which involves 70 scientists in total. Half of them are from Europe and one-fifth are from Canada. The rest are from the USA. How many scientists in this project are from the USA?

### Response:
 Kati ya wanasayansi wote wanaoshiriki katika mradi, nusu yao ni kutoka Ulaya, ambayo inamaanisha watu 70 * 0.5 = <<70*0.5=35>>35.
Idadi ya watafiti kutoka Canada ni 70 * 1/5 = <<70*1/5=14>>14.
Hii inamaanisha kuna watafiti 70 - 35 - 14 = <<70-35-14=21>>21 kutoka Marekani.