If jack is twice as old as lacy and three years ago the sum of their ages was thirty-nine, how old are they now?

Question

 How old are jack and lacy now if jack is twice as old as lacy and three years ago the sum of their ages was thirty-nine?

 

Answer 1

Let x = Lacy's age

Let 2x = Jack's age

(x - 3) + (2x - 3) = 39

3x - 6 = 39

3x = 45

x = 15

2x = 30