kristyn is 4 yrs younger than mario.three years from now she will be two thirds as old as mario. find the present age

Answer 1

NOW:
Mario --- x
Kristyn --- x-4

3years from now:
Mario ---- x+3
Kristyn--- x-1

"Three years from now, she will be 2/3 Mario's age"
----> (x-1) = (2/3)(x+3)

3x-3 = 2x+6
x=0

So now Mario is 9 and Krystyn is 5

check out both conditions stated, it works