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

### Instruction:
 Kuna wanafunzi 28 darasani. Wawili kati ya saba wao walikuwa hawapo Jumatatu iliyopita. Wanafunzi wangapi walikuwepo Jumatatu iliyopita?


### Response:
 28 x 2/7 = <<28*2/7=8>>8 wanafunzi walikuwa hawapo Jumatatu iliyopita.
Hivyo, wanafunzi 28 - 8 = <<28-8=20>>20 walikuwepo Jumatatu iliyopita.