pls help me i need to do a tape diagram or a pp/pw and if i do pp/pw i have to delete the incorrect one

Answer:
4 black pieces
Step-by-step explanation:
There are 12 pieces.
We have to find 1/3 of 12.
We get 4, so it is your answer.
All I got to do is have some knowledge of it what is your PP and pow usually it's the pp u take of ppw