Answer:
Catherine is 10, Aeneas is 4, Romeo is 9 and Jilliyn is 5
Step-by-step explanation:
Let Catherine's age be x, so Aeneas' age is 2/5x, Romeo's age is 2/5x+5 and Jilliyn's age is 2/5x+5-4, which is 2/5x+1.
The sum is 28, so x+2/5x+2/5x+5+2/5x+1=28, 11/5x+6=28, 11/5x=22, x=10
So, Catherine is 10, Aeneas is 4, Romeo is 9 and Jilliyn is 5