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

### Instruction:
A small airplane can seat 10 people in first class, 30 in business class, and 50 in economy class seating. If economy class is half full, and business class and first class have the same number of people together as economy class, how many seats are unoccupied in business class if only three people on the flight have first class seats?

### Response:
 Kuna watu 50 * 1/2 = <<50*1/2=25>>25 katika darasa la uchumi.
Kuna watu 25 katika darasa la biashara la kwanza na darasa la biashara, hivyo kuna 25 - 3 = <<25-3=22>>22 katika darasa la biashara.
Hivyo, kuna viti 30 - 22 = <<30-22=8>>8 visivyojazwa katika darasa la biashara.