Hello There!
This is a multiple step problem, to solve this you have to multiply and divide.
Steps
1. Divide 12 by 3
2. You should get 4, to check you're answer do 3*4 which equals 12
3. To find how many hexagons there are, you have to do 4*5 which equals 20
So, on Adriana's soccer ball if there are 12 pentagons, there should be 20 hexagons.
Hope This Helps :)