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

### Instruction:
A class has 60 students. The number of students who bring their lunch is thrice the number of those who eat in the school cafeteria. The rest of the students don't eat lunch. If 10 students eat in the school cafeteria, how many don't eat lunch?

### Response:
 Kuzidisha idadi ya wanafunzi wanaokula katika cafeteria mara tatu inamaanisha kwamba 3 * wanafunzi 10 = <<3*10=30>>30 wanafunzi wanaleta chakula cha mchana.
Kwa kuwa idadi jumla ya wanafunzi katika shule ni 60, wale ambao hawali chakula cha mchana ni wanafunzi 60 - wanafunzi 30 - wanafunzi 10 = <<60-30-10=20>>20 wanafunzi.