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

### Instruction:
Bill thought he bought 70 chihuahuas, but some of them turned out to be rats. If the number of rats was 6 times the number of chihuahuas, how many rats did he buy?

### Response:
 Acha r iwe idadi ya panya na c iwe idadi ya chihuahuas halisi. Tunajua kwamba r + c = 70 na r = 6c.
Kwa kubadilisha equation ya pili katika equation ya kwanza, tunapata 6c + c = 70
Kwa kuunganisha vipengele kama, tunapata 7c = 70
Kwa kugawanya pande zote mbili na 7, tunapata c = 10
Kwa kubadilisha thamani hii kurudi katika r = 6c, tunapata r = 6 * 10 = <<6*10=60>>60