Question

The ages of​ Edna, Ellie, and Elsa are consecutive integers. The sum of their ages is 108.

Answer 1

Let x = Edna's age

then it follows that  (x + 1) is Ellie's age and (x + 2) is Elsa's age

We can now write and equation for the sum of their ages equal to 108:
x + (x + 1) + (x +2) = 108  simplify the left side
3x + 3 = 108 subtract 3 from both sides
3x = 105   divide both sides by 3
x = 35
Edna is 35,  Ellie is 36, and Elsa is 37