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

### Instruction:
 Samuel has $5, $10, and $20 bills which amount to $150 in his wallet. His $10-bills amount to $50, and he has 4 $20-bills. How many bills does Samuel have in his wallet?


### Response:
 Samuel a 4 billets de 20 $, donc les 100 $ restants sont composés de billets de 10 $ et de 5 $.
Puisque les billets de 10 $ s'élèvent à 50 $, les 50 $ restants sont composés de billets de 5 $.
Par conséquent, Samuel a 4 billets de 20 $, 5 billets de 10 $ et 10 billets de 5 $, soit un total de 19 billets.