Answer:- Elvira is 37, Morton is 32 and Michelle is 16 years old.
Create some equations:-
Let Elvira's age be e , Morton's m years and Michelle's age = n years.
e + m + n = 85........... (1)
e - m = 5......................(2)
n = m/2
Substitute for n in the equation (1)
e + (3/2)m = 85........... (3)
Subtract equation (2) from equation 3:-
5/2 m = 80
m = 32
So e = m +5 = 37
and n = 32/2 = 16