Answer:
20/25, 4/5, 0.8, 80%
Step-by-step explanation:
There is a total of 25 children, only 5 plays the piano.
The children out of the total who plays the piano is 5/25
The children out of the total who doesn't plays the piano is 20/25
20/25 = 4/5 = 0.8 = 20/25 = 80%