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

### Instruction:
Olivia gave William 10 napkins. Amelia also gives William twice the number of napkins Olivia gave him. If William had 15 napkins before, how many napkins does he have now?

### Response:
After Olivia gave William 10 napkins, he ends up with 15+10 = <<15+10=25>>25 napkins.
Amelia gives William twice the number of napkins given to him by Amelia which is 2*10 = <<2*10=20>>20 napkins.
Altogether, William has 20+25 = <<20+25=45>>45 napkins.
#### 45