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?
How many napkins did William have after Olivia gave him 10 napkins? ** After Olivia gave William 10 napkins, he ends up with 15+10= <<10+15=25>>25 napkins.
How many napkins does Amelia give William? ** Amelia gives William twice the number of napkins given to him by Amelia which is 2*10 = <<2*10=20>>20 napkins.
How many napkins does William have now? ** The total number of napkins William has now is 20+25 = <<20+25=45>>45 napkins.
#### 45