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

### Instruction:
Brenda bakes 20 cakes a day. She does this for 9 days and then sells half of the cakes. How many cakes are left with Brenda?

### Response:
 Baada ya siku 9, Brenda anapika 9 * 20= <<9*20=180>>180 keki.
Baada ya kuuza nusu yao, kuna keki 180 / 2 = <<180/2=90>>90 zilizobaki.