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

### Instruction:
A pet shop has 2 puppies and some kittens. A puppy costs $20, and a kitten costs $15. If the stock is worth $100, how many kittens does the pet shop have?

### Response:
 Acha x iwe idadi ya paka.
2*20 + 15*x = 100
40 + 15*x = 100
15*x = 60
x = <<4=4>>4 paka