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

### Instruction:
 Brenda anapika keki 20 kwa siku. Anafanya hivi kwa siku 9 na kisha anauza nusu ya keki hizo. Kuna keki ngapi zilizobaki na 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.