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

### Instruction:
Jed collects stamp cards. Every week, he gets 6 cards. But every two weeks, he gives 2 cards to his friends. If Jed started with 20 cards, after how many weeks will he have a total of 40 cards?

### Response:
 Katika wiki ya kwanza atakuwa na 20 + 6 = <<20+6=26>>26 kadi.
Katika wiki ya pili atakuwa na 26 + 6 = <<26+6=32>>32 kadi.
Lakini anabaki na 32 - 2 = <<32-2=30>>30 kadi katika wiki ya pili baada ya kumpa rafiki zake kadi 2.
Kwa hiyo, katika wiki ya tatu atakuwa na 30 + 6 = <<30+6=36>>36 kadi.
Atakuwa na kadi 40 katika wiki ya nne kwa sababu 36 + 4 = <<36+4=40>>40.