15 points + brainliest if you can figure this out!

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

[15 points, algebra 2]simplify the complex fraction and find the restrictions.