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?
After Olivia gave William 10 napkins, he ends up with 15+10= <<10+15=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.
The total number of napkins William has now is 20+25 = <<20+25=45>>45 napkins.
#### 45