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

### Instruction:
 Trey a 7 fois plus de tortues que Kris. Kris a 1/4 autant de tortues que Kristen. Combien de tortues Trey a-t-il de plus que Kristen, si Kristen en a 12 ?


### Response:
 Kris a 12/4 = <<12/4=3>>3 tortues.
Trey a 3*7 = <<3*7=21>>21 tortues.
Trey a 21-12 = <<21-12=9>>9 tortues de plus que Kristen.