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

### Instruction:
In a block of flats, there are 120 apartments. 85% of them have at least 1 resident, while 60% of the apartments have at least two residents. How many apartments have only one resident?

### Response:
 Jumla ya makazi yenye angalau mkazi mmoja ni 120 * 0.85 = <<120*0.85=102>>102 makazi.
Jumla ya makazi yenye angalau wakazi wawili ni 120 * 0.6 = <<120*0.6=72>>72 makazi.
Makazi yenye wakazi 2 = 102 - 72 = <<102-72=30>>30 makazi.
Makazi yenye mkazi mmoja tu = 102 - 30 = <<102-30=72>>72 makazi.