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

### Instruction:
On a particular week, Fatima's restaurant served 25 people food and drinks, and 3/5 of that number came to buy coffee. How many people did not buy coffee in the restaurant?

### Response:
 Idadi ya wateja ambao walihudumiwa kahawa katika mgahawa ni 3/5*25 = <<3/5*25=15>>15
Ikiwa idadi jumla ya wateja ambao walikuja mgahawani ilikuwa 25, basi wateja 25-15 = <<25-15=10>>10 hawakununua kahawa.